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+2 votes
in Chemistry by (29.8k points)

Explain why BeH2 molecule has a zero dipole moment although the Be–H bonds are polar. 

2 Answers

+1 vote
by (128k points)
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The Lewis structure for BeH2 is as follows: 

There is no lone pair at the central atom (Be) and there are two bond pairs. Hence, BeH2 is of the type AB2. It has a linear structure.

Dipole moments of each H–Be bond are equal and are in opposite directions. Therefore, they nullify each other. Hence, BeH2 molecule has zero dipole moment. 

+1 vote
by (2.4k points)

the structue of BeH2

  H - Be - H

The bond are polar but the dipole moment e]which is developed towards one hydrogen is cancelled by other and so it dipole moment become zero

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