Hydrogen sulfide is a gas at room temperature, while water is a liquid, yet hydrogen sulfide has more electrons than water. explain this anomaly.

Hydrogen sulphide is slightly polar which mean only form of polar molecules taht exist for H2S are dispersion forces and dipole dipole forces which are quite weak.
on the other hand water experiences dispersion forces , dipole dipole forces are much stronger hydrogen bond all which sum up to be much stronger intermolcular forces relative to hydrogen sulphide's dispersion forces 

thus H2S experience weaker intermolecular forces , it is much easier to liquify and boil  and hence much less boiling point . water however has strong intermolecular forces so it give much high melting and  boiling point  as compared to H2S