Question

How can Phosphorus obtain 3 and 5 as its valency and what is variable valency

Answer 1

p has a valency of 3

Explanation:

P has 5 electrons in the outer most shell. So in order to be stable it will either loose 5 electrons or gain 3 electrons by following octet rule. Hence it is a non metal and non metals tend to gain electrons.

so P gain 3 electrons to acquire the noble has configuration.

It becomes P^-3 1s^2 2s^2 2p^6 3s^2 3p^6

Answer 2

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Answer:
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✔️p has a valency of 3

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Explanation:
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✔️P has 5 electrons in the outer most shell. So in order to be stable it will either loose 5 electrons or gain 3 electrons by following octet rule. Hence it is a non metal and non metals tend to gain electrons.

✔️So P gain 3 electrons to acquire the noble has configuration.

✔️It becomes P^-3 1s^2 2s^2 2p^6 3s^2 3p^6

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Variable Valency:
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✔️Variable valency is when an element exhibits more than one oxidation state. 

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