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STD 11 - 3. Classification of elements and periodicity in properties — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 3. Classification of elements and periodicity in properties4 Marks
Question
Number of elements from the following that $CANNOT$ form compounds with valencies which match with their respective group valencies is 

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

✓

Answer

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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