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The Na+ atom would be smaller and the Ne atom would bigger because they have the same number of electrons. However, since Na+ has one more proton, it has a tighter hold on its 10 electrons which makes the atom smaller.
The general rule is that cations are smaller than the noble gas/atom which are smaller than the anions. This is because in cations have more protons in their nucleus, resulting in a stronger attraction that pulls the electrons closer. Anions have fewer protons in the nucleus, so the attraction is weaker and the electrons are not as tightly held by the nucleus.
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