The element that exhibits neither electro-valency nor covalency is

The element Neon (Ne) belongs to VIIIA group and it is inert gas. Because Neon has octet configuration of its valency shell. Therefore, Ne exhibits neither electro valency nor covalency

Whereas the elements Sodium (Na) and Barium (Ba) are metals. Hence, the exhibits electro valency as positive 2 (${\mathrm{Na}}^{+} \& {\mathrm{Ba}}^{+2}$ ) . But the element Chlorine (Cl) is a non metallic therefore, it shows electro valency as well as covalency