When we calculate the electron pairs in NH3 we get 3.5 (1/2(3+5)=1/2×7) . But how it is possible,what the value of EP should we take?

When we calculate the electron pairs in NH3 we get 3.5 (1/2(3+5)=1/2×

1.	When we calculate the electron pairs in NH3 we get 3.5 (1/2(3+5)=1/2×7) . But how it is possible,what the value of EP should we take?
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