First slide

Periodicity in atomic properties

Question

With in each pair of elements of $F$ and $Cl . S$ and $Se,$ and $Li$ and $N a .$ respectively. the elements that release more energy upon an electron gain are

Moderate

A

$F . S e$ and $N a$
B

$F. S and L i$
C

$Cl. S and L i$
D

$Cl. Se and N a$

Solution

(i) Electron affinity of second period $p -$ block elements is less than third period $p -$ block element due to small size of second period $p -$ block element.
$E . A .$ order $: F < C l$
(ii) Down the group electron affinity decreases due to size increases
$E . A .$ order $: S > S e$
$L i > N a .$

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