Question

what is the bond polarity between the be atom and the h atom in a beh₂ molecule? nonpolar ionic polar metallic

Explanation:

Bond polarity is determined by the electronegativity difference ($\Delta \text{EN}$) between two atoms. The electronegativity of $\text{Be}$ is $1.57$ and that of $\text{H}$ is $2.20$. Calculate $\Delta \text{EN}=2.20 - 1.57=0.63$. A $\Delta \text{EN}$ between $0.5$ and $1.7$ indicates a polar covalent bond. Ionic bonds have $\Delta \text{EN}>1.7$, non - polar covalent bonds have $\Delta \text{EN}<0.5$, and metallic bonds occur between metal atoms (not relevant here as $\text{BeH}_2$ is a compound of a metal and non - metal).

Answer:

polar