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Atoms, subatomic particles, neutrons, protons, electrons

Most lightweight atoms are stable if their neutron/proton ratio is a 1:1 ratio, out of the following "light" elements, which one does not have a stable neutron/proton ratio?

F, N, O, Ne, Mg

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The periodic table is key to this type of question. You should know that atomic number corresponds to the number of protons (and in a neutral, "uncharged" atom the number of electrons too). But the atomic mass, corresponds top the ...

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