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Q:

The reactivity of an atom arises from

A) the existence of unpaired electrons in the valence shell B) the potential energy of the valence shell
C) the average distance of the outermost electron shell from the nucleus D) the sum of the potential energies of all the electron shells

Answer:   A) the existence of unpaired electrons in the valence shell



Explanation:

The reactivity of an atom arises from the existence of unpaired electrons in the valence shell.

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