Question

Na ion is smallet than Na atom why​

Answer 1

Explanation:

effective nuclear charge increases when electrons are removed from an atom. This means that the electrons now feel a greater attraction force from the nucleus, hence they are pulled tighter and the size of the Na ion is smaller than the size of the Na atom.

hope it helps........

Answer 2

Answer:

$Na^{+}$ ion is smaller than Na because both the species has same number of protons, but the number of electrons is less in Na+ ion, that's why it has a + charge on it. Due to less electrons, even though it's only 1 less than Na, the effective force(or effective nuclear charge) on all electrons increases because protons are more than electrons in Na+. Whereas, in Na, number of protons and electrons are equal, so effective nuclear is large and compensated.

simply.... Na+ has more nuclear charge than Na and attracts its electrons more, so, Na+ is smaller.