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What is the covalence of nitrogen in N2O...

What is the covalence of nitrogen in `N_2O_5` ?

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Dinitrogen pentoxide or nitrogen (V) oxide, `N_2 O_5` is a resonance hybrid of following two Lewis structures.

In both of these structures, nitrogen shows a covalency of 4.
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BETTER CHOICE PUBLICATION-THE P-BLOCK ELEMENTS-QUESTION BANK
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  10. Explain why orthophosphorus acid, H3 PO3 is diprotic .

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  15. Draw the structure of PCl3.

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