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Question

Which among the following elements has the tendency to form covalent compounds?


A
Ba
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B
Be
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C
Mg
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D
Ca
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Solution

The correct option is B $$Be$$
All the given elements are from II-A group. In general, moving from top to bottom in a group the ionic character increases and covalent character decreases. $$Be$$ is at the top in the group having the highest covalent character. $$Be$$ forms covalent compounds with $$Cl, Br$$ & $$I$$. $$Be$$ has $$2$$ valence electrons. Due to its small size, it has high polarizing power & forms a covalent bond.
Hence, the correct answer is B.

Chemistry

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