Question

Bef2 and H2o are both triatomic molecules but have different shapes why?

Answer 1

well water molecule has one lone pair of electrons on the central atom oxygen which results in dipole moment and shape distortion

Answer 2

BeF2 has linear shape because it's hybridization is sp and H20 has bent shape and tetrahedral geometry because it's hybridization is sp3 having two bond pair and one lone pair