SF₂, SF₄ and SF₆ have different shapes. Draw their Lewis structures and use the VSEPR theory to predict the name of the shape of each molecule.

Penalise missing lone pairs on fluorine atoms once in correct structures only.

For Lewis structures candidates are not expected to draw exact shapes of molecules.

Do not allow ECF for wrong Lewis structures.

Accept dots or crosses instead of lines.

This question was generally well answered and many high scores were seen. Common errors included the omission of non-bonding pairs of electrons on fluorine atoms and sometimes on sulfur. The shape of SF₄ was not well known but candidates were able to write correctly the name of the shape for SF₂ and SF₆.