In the periodic table, metallic character of the elements shows w… - Vidyadip

MCQ

In the periodic table, metallic character of the elements shows which one of the following trends?

A
Decreases down the group and increases across the period
✓
Increases down the group and decreases across the period
C
Increase across the period and also down the group
D
Decreases across the period and also down the group

✓

Answer

Correct option: B.

Increases down the group and decreases across the period

b
Inert pair effect may be defined as inertness of inner ns sub-shell towards chemical reaction.

It is seen in groups 3A and 4A especially ( $5 s$ and $6 s$ electrons).

Therefore $P b$ shows mainly +2 oxidation state frequently as compared to $+40 \times$ idation state.

So as we move down the group, due to inert pair effect lower oxidation state become more stable.

So, $G e^{2+} < S n^{2+} < P b^{2+}$

$G e^{4+} > S n^{4+} > P b^{4+}$

$S n^{4+}> S n^{2+}$

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