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Valency and Oxidation States

What are the ...

Question

What are the valencies of Si and Cl with atomic numbers 14 and 17 respectively?

A

3, 2

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B

4, 2

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C

2, 3

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D

4, 1

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Solution

The correct option is D 4, 1
Si needs $4$ electrons to reach the nearest noble gas configuration and complete its octet so its covalency is 4. Similarly, Cl needs $1$ electron for the same. Hence, the valency of Si and Cl is $4, 1$ respectively.

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