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Periodic Table and Periodicity question

2010 · Q119
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Periodic Table and Periodicity question

2010 · Q119

NEETChemistryPeriodic Table and PeriodicityMCQ+4 / −1
The correct order of the decreasing ionic radii among the following isoelectronic species is
  1. A
    Ca2+ > K+ > S2−-− > Clll−-−
  2. B
    Clll−-− > S2−-− > Ca2+ > K+
  3. C
    S2−-− > Cl−-− > K+ > Ca2+
  4. D
    K+ > Ca2+ > Cl−-− > S2−-−
View written solutionFree

Correct answer: C

For isoelectronic species, ionic radius increases when there is increase in negative charge. It happens because effective nuclear charge on the atom (Zeff) decreases.

Same when ionic radius decreases with increase in positive charge as Zeff increases.

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