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The correct option would be A. chlorine.

Chlorine is the only element there that would gain an electron.

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The question should be "which element forms an ion that is smaller than its atom".

The element which forms an ion that is smaller than its atom is; Choice 1: Chlorine, Cl

  • The periodic trend of elements across a period in the periodic table is on the basis that;

  • The more the electrostatic attraction between the nucleus of an atom and its electrons, the smaller is it's atomic or ionic radius.

  • In essence, the ions of highly electronegative elements are smaller than their atoms.

Chlorine is the electronegative element whose ion is smaller than its atom.

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