Which of Fe(II) and Fe(III) has the smallest radius?
Question
Which of Fe(II) and Fe(III) has the smallest radius?
Solution
Fe(III) has the smallest radius. When an atom loses electrons and becomes a cation, its radius decreases. This is because the loss of electrons reduces electron-electron repulsion and allows the remaining electrons to be pulled closer to the nucleus. Since Fe(III) has lost more electrons than Fe(II), it has a smaller radius.
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