# What atoms are in water?

Well, for a start, hydrogen and oxygen in a 2:1 ratio, hence ${H}_{2} O$.
The molecular formula of water is (as of course you know!) ${H}_{2} O$. The water molecule (as of course you know!) thus has 2 hydrogen atoms per oxygen atom.
The boiling point of water is $100$ ""^@C at atmospheric pressure, which is unusually high. This is much higher than comparable molecules, $N {H}_{3}$, ${H}_{2} S$, $S {O}_{2}$. The degree and extent of hydrogen bonding that occurs in water, as an intermolecular force, can rationalize water's unusual properties as a solvent.