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The atomic number of Oxygen is 8 and hence it has 8 protons and 8 electrons.
Oxygen has a mass number of 16. The number of neutrons is obtained my subtracting the number of protons from the mass number, i.e., 16-8 = 8. Therefore, Oxygen has 8 protons as well as 8 neutrons.
Now, Fe (Iron) is an interesting element. It has many isotopes. So, the exact number of neutrons is an estimated value. However, since the mass number has been given (56) we have to only determine the number of neutrons for this isotope of Iron. The number of protons is the same as the atomic number i.e., 26. The number of neutrons is obtained by subtracting the number of protons from the mass number , i.e., 56-26 = 30.
Therefore, according to the given data, Oxygen has 8 protons and 8 electrons. Iron has 26 protons and 30 neutrons.
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How many neutrons, not how much newtrons. Iron's atomic number is 26, so it has 26 protons; its atomic mass is approximately 56, which equals the number of protons and neutrons. 56 - 26 = 20 neutrons. While there are isotopes of iron with more or fewer neutrons, this is likely the answer you're expected to provide. If not, see Wikipedia "isotopes of iron".
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Osmium has as many protons as it needs
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39 protons
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How many protons does?
Bohrium has 107 protons.
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