Shapes of simple molecules and ions (3.1.3.5) | AQA A-level Chemistry - (7405) | KnowledgeSet

Shapes of simple molecules and ions

Chemistry · A-Level · AQA · AQA A-level Chemistry - (7405) · Specification point · 3.1.3.5 · Physical chemistry · Bonding

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3.1.3.5 Shapes of simple molecules and ions

Content	Opportunities for skills development
$Bonding pairs and lone (non-bonding) pairs of electrons as charge clouds that repel each other. Pairs of electrons in the outer shell of atoms arrange themselves as far apart as possible to minimise repulsion. Lone pair-lone pair repulsion is greater than lone pair-bond pair repulsion, which is greater than bond pair-bond pair repulsion. The effect of electron pair repulsion on bond angles. Students should be able to: explain the shapes of, and bond angles in, simple molecules and ions with up to six electron pairs (including lone pairs of electrons) surrounding the central atom.$	$MS 0.3 and 4.1 Students could be given familiar and unfamiliar examples of species and asked to deduce the shape according to valence shell electron pair repulsion (VSEPR) principles.$

Content

Opportunities for skills development

Bonding pairs and lone (non-bonding) pairs of electrons as charge clouds that repel each other. Pairs of electrons in the outer shell of atoms arrange themselves as far apart as possible to minimise repulsion. Lone pair-lone pair repulsion is greater than lone pair-bond pair repulsion, which is greater than bond pair-bond pair repulsion. The effect of electron pair repulsion on bond angles. Students should be able to: explain the shapes of, and bond angles in, simple molecules and ions with up to six electron pairs (including lone pairs of electrons) surrounding the central atom.

MS 0.3 and 4.1 Students could be given familiar and unfamiliar examples of species and asked to deduce the shape according to valence shell electron pair repulsion (VSEPR) principles.