K+ ,Cl- ,Ca2+ and S-2 are isoelectronic. The decreasing order of their size is :
Correct answer: A. S2->Cl->K+>Ca2+
- A. S2->Cl->K+>Ca2+
- B. Ca2+>K+>Cl->S2-
- C. Cl->S-2>Ca2+>K+
- D. K+>Cl->Ca2+>S2-
Explanation
Size of isoelectronic decreases with increase in atomic number. Therefore, option A is the correct answer.
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Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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