How many lone pairs of electron are there on the central atom of the H2O molecules?
-
A.
1 -
B.
2 -
C.
3 -
D.
4
Correct Answer: Option A
Explanation
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The electron-dot structure of NH 3 places one pair of non-bonding electrons in the valence shell of the nitrogen atom. This means that there are three bonded atoms and one lone pair for a coordination number of four around the nitrogen, the same as occurs in H 2O.