Why is $H_2O$ a liquid and $H_2S$ a gas?

(N/A) $H_2O$ has oxygen as the central atom. Oxygen has a smaller size and higher electronegativity compared to sulphur. Therefore,there is extensive hydrogen bonding in $H_2O$,which is absent in $H_2S$. Molecules of $H_2S$ are held together only by weak van der Waal's forces of attraction.
Hence,$H_2O$ exists as a liquid while $H_2S$ exists as a gas.