Consider the structure
Y\text{-}X\text{-}Y
If the symbol X represents a central atom, Y represents outer atoms, and Z represents lone pairs on the central atom,
the structure could be abbreviated as $XY_2Z_2$.
Classify each molecule according to its shape.
Linear
Bent
($\approx$ 120°)
Bent
($\approx$ 109°)
Trigonal
pyramidal
T-shaped See-saw
Square
planar
Square
pyramidal
Answer Bank
$XY_3Z$
$XY_5Z$
$XY_2Z_3$
$XY_2Z_2$
$XY_4Z_2$
$XY_2Z$
$XY_4Z$
$XY_3Z_2$