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Electronic Configuration of D-Block Elements

Why does phos...

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Why does phosphorus shows valency 5 along with three still it requires lot of energy?

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Q. Atomic number is Phosphorus is 15
Electronic configuration=K L. M
2. 8. 5
To form octet it requires 3 electron .Hence valency should be 3 but why is valency of Phosphorus is 5 as well as 3 .??

Q. Why does phosphorus show two valencies (3 and 5) ? Wouldn't it be easier to gain 3 electrons rather than losing 5 electrons? I mean if phosphorus loses five electrons, it'll have a 5+ charge, which is quite unstable, as explained in this video for carbon: https://youtu.be/4E8ShsaWssA .

Q. Why have a lot of countries still not adopted wind energy inspite of its potential?

Q. Why does nitrogen show catenation properties less than phosphorus?

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Electronic Configuration of D-Block Elements

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