Question

pls tell me the questions answer​

Answer 1

Answer:

There are two main reasons for showing variable valency

Inert pair effect in p-block elements.

Small energy difference between ns and (n-1)d sub shells in transition elements and ns and (n-2) sub shells in inner transition elements.

1. Inert Pair Effect

The electronic configurations of III A and IV A group elements are as

Variable Electrovalenc

Explanation:

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Answer 2

Answer:

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