what is mass number of an iron atom that has 28 neutrons?
- Anonymous1 decade agoFavorite Answer
mass number = atomic number + neutrons
iron atomic number is 26, so
mass number = 26+28 = 54
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- BettyLv 44 years ago
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atomic number of iron is 26. that means it has 26 protons. and it has 28 neutrons. mass number of an atom is the number of protons and neutrons ie total number of nucleons in its atom. therefore mass number = proton number + mass number = 26 + 28 = 54
- Anonymous1 decade ago
you have to add the number of neutrons to the number of protons to get the total mass number. so if you know the number of protons, subtract to get the mass number.