If you wanted a three-dimensional sense of the shape of a molecule and you were not interested in the internal bonds, which model would you use?

A space-filling model shows the molecule’s overall three-dimensional shape by representing atoms as spheres sized to reflect how much space they occupy. It does not emphasize the internal bonds, unlike a ball-and-stick model, which makes bonds visible as connectors. So the correct choice is the space-filling model.

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