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Session 6: Exploring the shapes of molecules

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Two ball-and-stick representations of methane CH4 (labelled (a) in the diagram) and bromomethane CH3Br (labelled (b) in the diagram). Both diagrams have a central carbon atom (shown as a grey sphere). Methane then has 4 white spheres connected to it (the hydrogen atoms). Bromomethane has 3 white spheres (hydrogen) and one red sphere (representing bromine).