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Predict the valencies of the elements wi...

Predict the valencies of the elements with atomic numbers 7 , 15 , 16 , 18 , 19 and justify Also give the formulae of hydrides formed by the above elements if any.

Text Solution

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Since N and P need three more electrons to attain an octet configuration, their valencies are 3.
Similarly, the valencies of other elements with atomic numbers 16, 18, 19 are 2, 0 and 1, respectively.
Except argon, all other elements form hydrides. Phosphorus `- PH_3`, Potassium - KH
Nitrogen `- NH_3`
Sulphur `- H_2S`
Argon does not form any compound
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