Which element 's ionic radius smaller than its atomic radius? Neon Nitrogen sodium Sulphur

Positive ions, which are smaller than the atoms of the same element, are created when an element loses an electron. As a result, these ions' ionic radius is less than their atomic radius. Since neon is stable, it won't gain or lose electrons. With each having a greater ionic radius than atomic radius, N and S will tend to acquire electrons.
Answer is sodium.