Question

Which member of IIA group shows covalency?

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

Answer 1

The correct option is B $Be$

Option $\left(B\right)$ is correct.

$Be$ shows covalency. Due to small size, can't ionize easily and high charge density on $Be$, its polarizing power is maximum, since $B{e}^{2+}$ essentially pull the electrons cloud with other elements rather than lose electrons.