It is important to know the difference between atoms, ions, and isotopes. choose all of the correct answers. an atom of oxygen and the ion of oxygen both have 8 protons. electrons must be removed from a carbon atom to form an isotope. the atomic mass of metals is calculated differently that the atomic mass of nonmetals. as you add or remove neutrons from the nucleus, isotopes are formed. the most massive subatomic particles are electrons. the isotope of carbon and the atom of nitrogen both have 7 protons in the nucleus.
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