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What is the covalence of nitrogen in N(2...

What is the covalence of nitrogen in `N_(2)O_(5)` ?

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Covalency depends upon the number of shared pairs of electrons. Now in `N_(2)O_(5)`, each nitrogen atom has four shared pairs of electrons as shown :
Therefore, the covalency of N in `N_(2)O_(5)` is 4.
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