Which of the followingelementscan showcovalencygreater than4 ?

1.	Which of the followingelementscan showcovalencygreater than4 ?
Answer» Be P S B SOLUTION :Elements Be and B LIE INTHE 2ndperioc. Theycan have amaximumof 8 ELECTRONICIN thevalenceshellInother words they can have amaximumcovalency of `8//2` = 4.Howeverelements P andS havevacant d- orbitalin theirrespectivevalenceshellsand hencecan accommodatemore than8 electrons in their respectivevalencel shells. In otherwordsthey canshow a covalencyof morethan 4. Thus , options ( b)and ( C)are correct.

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