Is water's bent shape unique? Or are there other molecules with this shape?

Question

ookawaiioo · Answer

Its has a tetrahedral configuration with bond angles roughly or less than 109.5 degrees due to the lone pairs of electrons. 

CH4 has the same shape.

aaronq · Answer

These shapes are based on VSEPR; using this system the shapes of water and methane are not the same. 

You'd want to look down the column of oxygen, as atoms in any column will behave similarly. 

We have: Oxygen: $H_2O$ dihydrogen monoxide, bent
below, Sulfur: $H_2S$ hydrogen sulfide, bent
Selenium: $SeH_2$ hydrogen selenide, bent

anonymous · Answer

Thanks! Would the same principle apply to replacing Hydrogen with other atoms of the Group 1 column? (ie. Li2O or Na2O)

aaronq · Answer

The "principle" applies only when the bonds that attach the atoms are covalent. 

Ionic bonding in, for example, sodium sulfide $Na_2S$, would not be restricted to the "fixed" bonding models you use in VSRPR, and more importantly, it exists as lattices of many units that form crystal structures (i.e. not molecular).

So, the method of replacing H for atoms with group 1 works because of the charges, but these cannot be analyzed by VSEPR nor can they be given a shape according to this model.

anonymous · Answer

Oh, I see! Thank you for your help c: