When an atom gains or loses electrons,the ion formed will have the same radius (size).

Question

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When an atom gains electrons, it becomes a negatively charged ion (anion) and its radius increases due to increased electron-electron repulsion in the electron cloud. When it loses electrons, it becomes a positively charged ion (cation) and its radius decreases because there are fewer electrons to be repelled and the effective nuclear charge on the remaining electrons increases, pulling them closer to the nucleus.

When an Atom Gains or Loses Electrons,the Ion Formed Will