Question
$\mathrm{BeF}_2$ molecule is linear while $\mathrm{SF}_2$ is angular through both are triatomic?
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Answer
In $\mathrm{BeF}_2$, Be is the central atom and is surrounded by 2 bond pairs only therefore, the molecule is linear. On the other hand, in $\mathrm{SF}_2$, the central atom S is surrounded by 2 bond pairs and 2 lone pairs. Since at is surrounded by 4 electron pairs, the geometry is expected to be tetrahedral with two position occupied by lone pairs.
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