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Ammonia dot-and-cross diagram
Nitrogen reacts with hydrogen to produce ammonia (NH₃).
Complete the dot and cross diagram for an ammonia molecule.
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Marking points
- 1 Places one shared electron pair in each of the three N–H overlaps.
- 2 Places one lone pair, two non-bonding electrons, on nitrogen.
Full-mark answer
Add one shared pair of electrons in each of the three overlaps between N and H, and add one lone pair of two electrons in the nitrogen outer shell away from the overlaps.
Why this answer loses marks
Put the non-bonding pair on a hydrogen atom.
The official scheme rejects a lone pair on hydrogen; the two non-bonding electrons belong on nitrogen.