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Question

Which of the following forms only covalent bonds with other elements?

A
Calcium
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B
Barium
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C
Radium
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D
Beryllium
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Solution

The correct option is D Beryllium
Beryllium's chemical behavior is largely a result of its small atomic and ionic radii. It thus has very high ionization potentials and strong polarization while bonded to other atoms, which is why all of its compounds are covalent.
They form covalent bonds whereas the other members form of the group form ionic bonds.

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