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Periodic Table and Periodicity question

2015 · Q95
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Periodic Table and Periodicity question

2015 · Q95

NEETChemistryPeriodic Table and PeriodicityMCQ+4 / −1
The species Ar, K+ and Ca2+ contain the same number of electrons. In which order do their radii increase ?
  1. A
    Ca2+ < K+ < Ar
  2. B
    K+ < Ar < Ca2+
  3. C
    Ar < K+ < Ca2+
  4. D
    Ca2+ < Ar < K+
View written solutionFree

Correct answer: A

For isoelectronic species, radius of atom decreases with increase in nuclear charge.

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