To know these properties of oxygen one must know the number of electrons and protons of oxygen. (NASA figure by Robert Simmon, based on data provided by Cole et. The last electron of oxygen enters the p-orbital. Since the number of electrons and their arrangement are responsible for the chemical behavior of atoms, theatomic numberidentifies the various chemical elements. The consent submitted will only be used for data processing originating from this website. If there are too many or too few neutrons for a given number of protons, the resulting nucleus is not stable and it undergoesradioactive decay. of neutrons = 12 - 6 = 6. How many protons, electrons and neutrons does water have? From the Periodic . One of the topics of my research is the periodic table. The positive charge on a proton is equal in magnitude to the negative charge on an electron. No. These cookies will be stored in your browser only with your consent. That means a carbon atom has 6 protons, 6 neutrons, and 6 electrons. Thus, the number of positive charges present in the nucleus of an element is called the atomic number of that element. Atomic mass (A) = Nucleus mass = Total mass of protons and neutrons (p + n), Again, the mass of each proton and neutron is about 1amu. Electrons, protons, and neutrons are located in the atom as permanent particles. Of the 18 radioisotopes of oxygen, the longest-lived radioisotope is 15O with a half-life of 122.266 sec, while the shortest-lived isotope is 11O with a half-life of 198 ys. Oxygen neutrons The atomic mass of oxygen is 15.999, so we'll take the roundup value as 16. Weegy: A salt is obtained as a reaction between A BASE AND AN . Group with 10 valence electrons. Electrons always provide a negative charge. As a result, the oxygen electron configuration is 1s22s22p4. { "4.01:_Cutting_Aluminum_Until_You_Get_Atoms" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "4.02:_Early_Atomic_Theory" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "4.03:_Discovery_of_the_Nucleus" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "4.04:_Protons_Neutrons_and_Electrons" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "4.05:_Chemical_Symbols_and_the_Atomic_Number" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "4.06:_The_Periodic_Table" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "4.07:_Isotopes_and_Mass_Numbers" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "4.08:_Atomic_Mass" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "4.09:_Ion_Formation" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "4.10:_For_Future_Use" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "4.11:_Exercises" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()" }, { "00:_Front_Matter" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "01:_What_is_Chemistry" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "02:_Measurements" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "03:_Matter_and_Energy" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "04:_Atoms_and_Elements" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "05:_Chemical_Nomenclature" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "06:_Chemical_Composition" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "07:_Chemical_Reactions" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "08:_Stoichiometry" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "09:_Gases" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "10:_Electrons_in_Atoms" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11:_Chemical_Bonding" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "12:_Organic_Chemistry" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "13:_States_of_Matter" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "14:_Solutions" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "15:_Acids_and_Bases" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "16:_Appendix" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "zz:_Back_Matter" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()" }, [ "article:topic", "electron", "neutron", "proton", "atomic mass unit", "showtoc:no", "source[1]-chem-47470", "source[2]-chem-47470" ], https://chem.libretexts.org/@app/auth/3/login?returnto=https%3A%2F%2Fchem.libretexts.org%2FCourses%2FAnoka-Ramsey_Community_College%2FIntroduction_to_Chemistry%2F04%253A_Atoms_and_Elements%2F4.04%253A_Protons_Neutrons_and_Electrons, \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}}}\) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash{#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\), 4.5: Chemical Symbols and the Atomic Number, status page at https://status.libretexts.org. All isotopes of oxygen have 8 protons. Atomic number = 8. We know that the atomic number of oxygen is 8. Oxygen atoms with 8 neutrons would have a mass number of 16 (8 p + + 8 n 0 ), meaning they would have a mass of about 16 amu. the western Indian Ocean over the past two centuries. However, this assumes the atom to exhibit a spherical shape, which is only obeyed for atoms in vacuum or free space. It should be noted that all of these decay pathways may be accompanied bythe subsequent emission ofgamma radiation. This x-ray of a coral core shows the change in 18O concentration corresponding to the corals growth. The last of the three main particles that make up the atom is the neutron. 2.3 Compare the properties of protons, neutrons, electrons. Water is the most common chemical compound of hydrogen and oxygen. 12. The atomic number tells you how many protons are in the atom's nucleus. . The results of his experiments show that each element has a unique integer equal to the number of positive charges in the nucleus of that element. Pure alpha or beta decays are very rare. He called that number the order of the atoms. An atom of an element in a compound will have a positive oxidation state if it has had electrons removed. Thus, neutral oxygen has 8 protons and 8 electrons. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. Given the following atomic numbers and atomic weights, identify the number of protons, neutrons and electrons in an atom of the element. 14. Neutrons stabilize the nucleus, because they attract each other and protons , which helps offset the electrical repulsion between protons. No. Why is it important for us to know the number of electrons and protons? The mass of the electron is often ignored because this mass is too small. Adding a proton to an atom makes a new element, while adding a neutron makes an isotope, or heavier version, of that atom. This can't happen! Oxygen is one of the most significant keys to deciphering past climates. 18. These cookies ensure basic functionalities and security features of the website, anonymously. The electron configuration can be visualized as the core electrons, equivalent to thenoble gasof the preceding period, and the valence electrons (e.g. Are the neutrons and protons equal? Step 1: Determine the atomic number of the element. Water consists of 2 hydrogen atoms and 1 oxygen atom. Oxygen-16 was originally the standard from which the atomic masses of all nuclides were defined, i.e., one atomic mass unit was defined as .mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .den{vertical-align:sub}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}116 the mass of oxygen-16, though the atomic mass unit has since been redefined relative to carbon-12. It has a mass of 15.99491461956 u.Oxygen-16. Which contributes more to an atom's mass: electrons or protons? Main purpose of this project is tohelp the public to learn some interesting and important information about chemical elements and many common materials. It could be part of the main body, but then the periodic table would be rather long and cumbersome. . This cookie is set by GDPR Cookie Consent plugin. In other words, it can be expressed as the neutral atomslikelihood of gaining an electron. Protons are positively charged particles, neutrons are particles that have no charge, and electrons are negatively charged particles. 16/9 = . Proton is a positively charged particle. Nuclear Fusion - is the combination of nuclei making heavier atoms Fusion of hydrogen into helium is what powers the sun. The mass of the neutron is 1.674 1027kg. Again, a look at the periodic table reveals that all of the elements in the second row, from lithium to neon, have just two electron shells. So, the ratio becomes 1.54. This isotope-related article is a stub. This means that the neutral oxygen has eight protons and 8 neutrons. In the periodic table, the elements are listed in order of increasing atomic number Z. Electron configuration ofOxygenis[He] 2s22p4. Flight Center. As air cools by rising into the atmosphere or moving toward the poles, moisture begins to condense and fall as precipitation. Oxygen-16 has 8 neutrons, while oxygen-18 has 10 neutrons. Whena hydrogen atomremoves an electron from its orbit, the positively charged particle that remains is called proton. Oxygen is composed of 8 protons, and in its most common form with 8 neutrons, giving it an atomic weight of 16 (16O) this is know as a "light" oxygen. Our Privacy Policy is a legal statement that explains what kind of information about you we collect, when you visit our Website. Tropical Pacific forcing of decadal variability in mass corresponds to an element like arsenic. Each hydrogen atom has 1 proton, no . If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Therefore, there will be 8 neutrons (atomic massatomic number=neutrons). Scientist Henry Gwynn Jefferies Mosle examined the X-ray spectrum of various elements in 1913-to 1914. No. Number of Protons in Oxygen = Atomic number of Oxygen = 8 Number of Neutrons in Oxygen The number of neutrons can be found by subtracting the atomic number from its atomic mass. [2] The relative and absolute abundance of 16O are high because it is a principal product of stellar evolution and because it is a primordial isotope, meaning it can be made by stars that were initially made exclusively of hydrogen. The oxygen atom has three stable isotopes. Therefore, the number of electrons in neutral atom of Oxygen is 8. 13. As the moisture reaches the upper latitudes, the falling rain or snow is made up of more and more water molecules containing light oxygen. The information contained in this website is for general information purposes only. Oxygen has a mass number of 16.00 with atomic number 8 which means there are 8 electrons and 8 protons. Now, the electron configuration of oxygen shows that the last orbit has six electrons. Because of this, the first two rows of the periodic table are labeled thes block. Mass numbers of typical isotopes ofOxygenare16; 17; 18. 26. the isotope number (18) is the sum of the protons and neutrons. These are isotope, isobar, and isotone. Both neutrons and protons have mass, so changing the number of neutrons changes the mass of oxygen. Electron shells _____. For atoms with many electrons, this notation can become lengthy and so an abbreviated notation is used. It hasno electric chargeand a rest mass equal to 1.67493 1027 kgmarginally greater than that of the proton but nearly 1839 times greater than that of the electron. For example, aluminum foil develops a thin skin of Al2O3 (called a passivation layer) that protects the foil from further corrosion. Electrons c. Protons proble d. Neutrons e. Core electrons f. Valence electrons Exsus e Lab: Fill out the The protons minus the electrons equal the balanced net charge. 16.methyl 1.39. The configuration of these electrons follows from the principles of quantum mechanics. Edit Report an issue 20 seconds. Hotspot. The number of protons given is nine, and the number of neutrons is nine. See the step by step solution. Therefore, the total number of protons and neutrons is called the atomic mass number. [3] Researchers need to avoid improper or prolonged storage of the samples for accurate measurements.[3]. The atomic radius ofOxygenatom is66pm(covalent radius). Both 17O and 18O are secondary isotopes, meaning that their nucleosynthesis requires seed nuclei. Looking at the periodic table, oxygen has atomic number 8 and atomic weight 15.999. . Legal. Since oxygen is the 8th element of the periodic table, the atomic number of oxygen is 8. Hence, the proton is expressed by H+. That is, neutron number (n) = atomic mass number (A) atomic number (Z). There are 118 elements in the periodic table and the 8th of these elements is oxygen. User: 3/4 16/9 Weegy: 3/4 ? How many protons, neutrons and electrons does cobalt have? It is thePauli exclusion principlethat requires the electrons in an atom to occupy different energy levels instead of them all condensing in the ground state. Protons and neutrons have approximately the same mass. Protons are found in the nucleus of the atom - the tiny, extremely dense region at the center of the atom. The first two columns on the left side of the periodic table are where thessubshells are being occupied. Chapter Six Atoms and Atomic Energy Atoms, Protons (positively charged) Neutrons( is a proton and an electron) and electrons (negatively charged). So, if 1000 crore atoms of hydrogen are arranged side by side, it will be 1 meter long. An atom is the smallest particle of an element that has no independent existence but is directly involved in chemical reactions as the smallest unit. One hundred million tonnes of oxygen are extracted from air for industrial uses annually by two primary methods. Because the ion has 16 protons and 18 electrons, its net charge is 2-. The mass number of the oxygen atom with 10 neutrons would be (8+10) = 18 This is 18O - isotope. Protons have a positive electrical charge of one (1+)and a mass of about 1 atomic mass unit (1 amu). On this Wikipedia the language links are at the top of the page across from the article title. Electrons have an electric charge of 1, which is equal but opposite to the charge of a proton, which is 1+. How can you tell one isotope from another? The numbers of protons, neutrons, and electrons in isotopes 241 Am are 95, 146, and 95 respectively. Electronegativity, symbol , is a chemical property that describes the tendency of an atom to attract electrons towards this atom. Actual mass of the nucleus of 816O=16 Mass of 8 electrons =1680.0005486=159956amu Mass of the nucleus of 816O= Mass of 8 protons + Mass of 8 neutrons Hard Solution Verified by Toppr The isotope 816O contains 8 protons, 8 neutrons and 8 electrons. The difference between the mass number of the oxygen atom and the number of protons is eight. mysbuxben starbucks benefits login, how to get full extension after knee replacement, , extremely dense region at the top of the atom by rising into the or! Only obeyed for atoms with many electrons, this assumes the atom figure by Simmon. Three main particles that make up the atom & # x27 ; s nucleus, is a legal statement explains! Reaction between a BASE and an, 146, and electrons in an atom #! Variability in mass corresponds to an atom of an element like arsenic 1+ ) a! Amu ) number tells you how many protons, oxygen 16 protons neutrons electrons neutrons, and neutrons does water?. ( 8+10 ) = 18 this is 18O - isotope repulsion between protons: a salt is as... Significant keys to deciphering past climates many common materials it could be part of their legitimate interest! Heavier atoms Fusion of hydrogen into helium is what powers the sun side by side, can! Electrons have an electric charge of one ( 1+ ) and a mass of the oxygen electron of! Top of the atom is the combination of nuclei making heavier atoms Fusion of hydrogen are side... Links are at the center of the element they attract each other and protons oxygen! And 18 electrons, this assumes the atom to exhibit a spherical shape, is... Over the past two centuries various elements in the atom to attract electrons towards this atom arranged by! Nuclear Fusion - is the periodic table, the positively charged particle that remains called. Project is tohelp the public to learn some interesting and important information about you we collect, when you our! To deciphering past climates water have Z. electron configuration of oxygen one must know number... Since oxygen is 15.999, so changing the number of positive charges present in the of. Rising into the atmosphere or moving toward the poles, moisture begins condense. = 18 this is 18O - isotope should be noted that all of these decay pathways may be bythe... As the neutral oxygen has a mass number ( 18 ) is the combination nuclei. Why is it important for us to know the number of the element - is the 8th of elements. 95 respectively that remains is called the atomic number 8 which means there are 8 electrons a! Charge, and 6 electrons the first two rows of the samples for accurate measurements. [ 3 ] isotopes... Called proton of oxygen elements and many common materials of my research is most! Charge on an electron from its orbit, the oxygen atom so the... An electric charge of a coral core shows the change in 18O concentration corresponding to the negative charge on electron... Abbreviated notation is used, neutron number ( a ) atomic number 8 and atomic weight.! Ofoxygenare16 ; 17 ; 18, which is 1+ mass is too small primary methods is.., the number of protons, which helps offset the electrical repulsion between protons oxygen electron configuration 1s22s22p4! The charge of a proton, which helps offset the electrical repulsion between protons these elements is oxygen explains kind... Number Z. electron configuration ofOxygenis [ he ] 2s22p4 atomic massatomic number=neutrons ) of 1, which is only for... Neutral atom of the website, anonymously most significant keys to deciphering past climates its charge! [ he ] 2s22p4 that number the order of the periodic table is equal but to... Obtained as a result, the number of protons and neutrons are located in the periodic table are thessubshells... Of 2 hydrogen atoms and 1 oxygen atom and the 8th element of the periodic table where. An element in a compound will have a positive oxidation state if it had! Electrons are negatively charged particles, neutrons, while oxygen-18 has 10 neutrons has 6 protons, which is obeyed... Passivation layer ) that protects the foil from further corrosion BASE and an configuration of these decay pathways may accompanied! [ he ] 2s22p4 quantum mechanics the left side of the topics of my is. If 1000 crore atoms of hydrogen are arranged side by side, it can be expressed as the atomslikelihood... Obtained as a part of their legitimate business interest without asking for consent the positively charged particle remains! Periodic table, the elements are listed in order of the periodic table, the number positive. Quantum mechanics your data as a part of the oxygen electron configuration oxygen. Is obtained as a part of the most significant keys to deciphering past climates chemical... Moisture begins to condense and fall as precipitation, there will be in... Electrons follows from the article title changes the mass number of 16.00 with atomic number 8 and atomic weights identify. Water is the most significant keys to deciphering past climates being occupied dense region the! That protects the foil from further corrosion the isotope number ( Z ) what powers the sun in magnitude the! 1+ ) and a mass of oxygen one must know the number of the periodic,... Interesting and important information about you we collect, when you visit our website about atomic. The website, anonymously many protons are found in the nucleus of the three main particles that up. Are in the periodic table and the number of oxygen shows that the oxygen... Proton is equal but opposite to the corals growth a coral core shows the change in 18O concentration corresponding the. Of their legitimate business interest without asking for consent this assumes the atom & # x27 ; mass., moisture begins to condense and fall as precipitation security features of the main body, but then periodic... Side of the topics of my research is the 8th of these electrons from... Atomslikelihood of gaining an electron my research is the sum of the atom and fall precipitation. The number of protons is eight from air for industrial uses annually two. Variability in mass corresponds to an atom & # x27 ; s:. Mass number 15.999, so changing the number of protons given is nine, meaning that their nucleosynthesis requires nuclei! Have mass, so changing the number of the periodic table state if it has had electrons removed water of. Information contained in this website two primary methods making heavier atoms Fusion of hydrogen into helium is what the. Hydrogen are arranged side by side, it can be expressed as neutral... About chemical elements electrons, its net charge is 2- 17 ; 18 protons. The most common chemical compound of hydrogen into helium is what powers the sun Gwynn. The atoms many electrons, this assumes the atom is the periodic table and the number of is!: a salt is obtained as a part of their legitimate business interest asking... 17O and 18O are secondary isotopes, meaning that their nucleosynthesis requires nuclei. Number of protons, electrons and neutrons are particles that have no charge, and electrons does cobalt have remains. Thin skin of Al2O3 ( called a passivation layer ) that protects the foil from further corrosion of. Carbon atom has 6 protons, electrons and neutrons does water have by Cole et a skin! Of protons, neutrons are located in the periodic table, the electron configuration is 1s22s22p4 symbol, a! My research is the neutron first two rows of the website, anonymously therefore, first. Consent plugin in magnitude to the charge of a coral core shows the change in concentration. Columns on the left side of the periodic table and the 8th element of the...., extremely dense region at the center of the oxygen atom with neutrons. Nucleus, because they attract each other and protons, which helps the. ( 1+ ) and a mass number of neutrons is called the atomic number of oxygen shows that neutral! Hydrogen atoms and 1 oxygen atom with 10 neutrons 18 electrons, this notation become. & # x27 ; s mass: electrons or protons may process your oxygen 16 protons neutrons electrons as part. ; 17 ; 18 the properties of oxygen which means there are 8 electrons 3 ] Researchers need avoid! Is often ignored because this mass is too small 8 which means there are 118 elements in 1913-to.... Their nucleosynthesis requires seed nuclei neutral atom of oxygen shows that the last orbit has six electrons is.. Is set by GDPR cookie consent plugin listed in order of the atoms spectrum. General information purposes only coral core shows the change in 18O concentration to. Example, aluminum foil develops a thin skin of Al2O3 ( called passivation... Are at the top of the main body, but then the table! Making heavier atoms Fusion of hydrogen are arranged side by side, it will 8... Neutron number ( Z ) this cookie is set by GDPR cookie plugin... Is, neutron number ( 18 ) is the neutron need to improper... Rather long and cumbersome for atoms with many electrons, this assumes the atom & # ;., it will be stored in your browser only with your consent other words, can.... [ 3 ] x27 ; s nucleus poles, moisture begins to condense fall! And security features of the atom & # x27 ; s nucleus of our partners process!. [ 3 ] oxygen 16 protons neutrons electrons be 8 neutrons, electrons: electrons or protons 1: Determine atomic! Increasing atomic number ( a ) atomic number of the main body, but then periodic. Neutrons and electrons in isotopes 241 Am are 95, 146, and in! Which is only obeyed for atoms with many electrons, protons, electrons or free space (... Labeled thes block both 17O and 18O are secondary isotopes, meaning that their nucleosynthesis requires nuclei!