Explain why $BeH_{2}$ molecule has a zero dipole moment although the $Be-H$ bonds are polar.
(N/A) The Lewis structure for $BeH_{2}$ 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 are in opposite directions. Therefore,they nullify each other. Hence,$BeH_{2}$ molecule has zero dipole moment.
$H : Be : H$
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 are in opposite directions. Therefore,they nullify each other. Hence,$BeH_{2}$ molecule has zero dipole moment.
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