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JIPMER 2004
Exam
JIPMER
Year
2004
Subject
Chemistry
Chapter
Structure of Atom

JIPMER 2004 · Chemistry · Structure of Atom

Which of the following ions, has smallest size?

Which of the following ions, has smallest size?

Options

  1. ACa2+\mathrm{Ca}^{2+}
  2. BCl−\mathrm{Cl}^{-}
  3. CS2−\mathrm{S}^{2-}
  4. DK+\mathrm{K}^{+}

Correct answer

A. Ca2+\mathrm{Ca}^{2+}

Step-by-step solution

Ca2+,Cl−,S2−\mathrm{Ca}^{2+}, \mathrm{Cl}^{-}, \mathrm{S}^{2-} and K+\mathrm{K}^{+}are isoelctronic species. In isoelectronic ions, size decrease with increasing nuclear charge. Hence, Ca2+\mathrm{Ca}^{2+} ion is the smallest among these.
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