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CH2 (WJEC Syllabus Topic 4.3): shapes of molecules and ions
(a) Explain what is meant by the terms lone pairs and bonding pairs of electrons and recall
and explain
The sequence of repulsions between: two bonding pairs a bonding pair and a lone pair two
lone pairs.

Lone pair: a…

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(c) recall and explain the shapes of the species listed (recall of exact bond angles is required
for BF3,
CH4, SF6 and NH4
+) and apply the VSEPR principle to predict or explain the shapes of other specified
simple species involving up to six electron pairs in the valence shell…

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