Question

which of these elements are unlikely to form covalent bonds? S, H, K, Ar, Si

Answer 1

Atoms make chemical bond by sharing electrons equally between each other, these bonds are called as covalent bonds. Generally covalent bonds are formed by atoms having same electronegativity i e nearly same tendancy to attract electrons.

If we see periodic table , elements placed on left hand side have tendency to loose electrons so they form generally ionic compound.

K has tendancy to form ionic bond.

Si , S are nonmetals ,they have tendency to attract electrons so they form covalent bonds.

H also forms covalent bonds.

Ar is a inert gas element and have no tendecy to form bonds.