Question

Which among the following elements has the tendency to form covalent compounds?

• A. $Ba$
• B. $Be$
• C. $Mg$
• D. $Ca$

Answer 1

The correct option is B $Be$

All the given elements are from II-A group. In general, moving from top to bottom in a group the ionic character increases and covalent character decreases. $Be$ is at the top in the group having the highest covalent character. $Be$ forms covalent compounds with $Cl,Br$ & $I$. $Be$ has $2$ valence electrons. Due to its small size, it has high polarizing power & forms a covalent bond.

Hence, the correct answer is B.