First slide

Periodicity in atomic properties

Question

Which of the following species have incorrect order of size?

Moderate

A

$O^{2 -} > O^{-} > F^{⊖} > F$
B

$O^{⊖} > O^{2 -} > F^{⊖} > F$
C

$O^{2 -} > F^{⊖} > O^{⊖} > F$
D

$O^{2 -} > F^{⊖} > F > O^{⊖}$

Solution

They are not isoelectronic species. Size of O > size of F, along the 2nd period ( $\to$ ) size decreases. Size of more negatively charged ion is greater than less negatively charged ion and size of neutral atom is greater than positively charged ion. Hence the order is
$O^{2 -} > O^{⊖} > F^{⊖} > F$

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