First slide

Classical approach of classification of elements

Question

Which set does not show correct matching?

Moderate

A

${Sc}^{3 +} [Ne] 3 s^{2} 3 p^{6}] Zero group$
B

${Fe}^{2 +} [Ar] 3 d^{6} VIII group$
C

$Cr [Ar] 3 d^{5} 4 s^{1} VI B group$
D

All of the above

Solution

${Sc}^{3 +} (18 e^{-}) : [Ne] 3 s^{2} 3 p^{6} Sc : [Ne] 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{1}$
Thus, d-block III B group.
Thus, given matching is incorrect.

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