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Which of the following elements does not form a monatomic ion?

A.potassium

B.sulfur

C.chlorine

D.xenon

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C.chlorine

Explanation;

A monatomic ion is an ion consisting of exactly one atom. If it has more than one atom, then it is called polyatomic. If it has two atoms it is diatomic, three atoms, it is triatomic, and so forth.

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