Chemistry, asked by TheKnowledge, 1 year ago

Why phosphorus show VARIABLE valency ??


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Answers

Answered by princesxaaizajp630xe
5
Valency of 3 is due to requirement of 3 more electrons to complete it's octet. The valency of 5 is due to exitation of an electron from 3s orbitals to 3d orbital .This leads in formation of 5 sp3d hybrid orbitals and hence phosphorous shows a valency of 5.

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Answered by Shreya2001
7
★ HERE IS YOUR ANSWER ★

The combining power or the combining capacity of an atom or an element is called its valency. Valency of an element is decided by number of outermost shell electrons. If an element exhibit more than one valency . This is known as variable valency.

For example-
Phosphorus can show a valency of 3 and 5

Reason for occurrence of variable valencies:
Involvement of available of vacant sub-shell in bonding. (d-orbital) : some of the elements have vacant sub-shell in same energy level. so they expand their valency and exhibit more than 1 valency in its compound. Phosphorus form PCl3 and PCl5 with chlorine. 3 is the normal valency of phosphorus. But in PCl5 , phosphorus forms 5 bond with chlorine atoms by involving its vacant sub-shell (d orbital ).Detail of these will be in higher classes.

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