First slide

Modern approach of classification of elements

Question

Which set has the same number of unpaired electrons in their ground state

Moderate

A

$Cl, {Fe}^{3 +}, {Cr}^{3 -}$
B

${Na}^{1 +}, {Mg}^{2 +}, Al$
C

$Na, P, Cl$
D

$N,P,V$

Solution

$N$ and $P$ have 3 unpaired electrons in $2 p$ and $3 p$ respectively; $V$ has 3 unpaired electrons in 3d .

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