Number of elements from the following that CANNOT form compounds … - Vidyadip

MCQ

Number of elements from the following that $CANNOT$ form compounds with valencies which match with their respective group valencies is

$B, C, N, S, O, F, P, Al, Si$

A
$7$
B
$5$
C
$6$
✓
$3$

✓

Answer

Correct option: D.

$3$

d
$\mathrm{N}, \mathrm{O}, \mathrm{F}$ can't extend their valencies upto their group number due to the non-availability of vacant $2$d like orbital.

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