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Electron Distribution in Different Orbits

Why phousphou...

Question

Why phousphous shows 3 and 5 valence?

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Solution

Phousphous shows 3 and 5 valence :

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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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. Phosphorus has valencies of 3 and 5.
What is the formula of the two oxides of phosphorus?

Do phosphorus and potassium shows any similarities between their chemical and physical properties? If yes then why? Or no then why?

The number of electrons in the valence shell of phosphorus (Z = 15) is 5. True or False

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