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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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