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In the scenario of two elements being isoelectronic, why wouldn't the element gaining or losing electrons entirely become the other element it's isoelectronic to? Ie. Why wouldn't F- just become Ne?
The feature that distinguishes elements is their atomic number, which is just the number of protons in their nucleus. The difference, then, between Fluorine and Neon is not their number of electrons or electron orbitals: it is the number of protons in their respective nuclei. Fluorine has nine protons; Neon has ten. F-, then, doesn't become Ne because F- still has nine protons. It is thus an anion of Fluorine but still very much Fluorine because the number of protons has not changed.
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