Explain why BeH_(2) molecule has a zero dipole moment although the Be

1.	Explain why BeH_(2) molecule has a zero dipole moment although the Be - H bonds are polar.
Answer» Solution :The Lewis structure for `BeH_(2)` molecule is as FOLLOWS: H : Be : H There is no lone PAIR at the central atom (Be) and there are two bond PAIRS. Hence, `BeH_(2)` is of the type `AB_(2).` It has a linear structure. Dipole moments of each Be--H bond are equal and opposite in direction. THEREFORE, they NULLIFY each other. Hence, `BeH_(2)` hasa net zero dipole moment.

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