Class 11 NEET Chemistry Classification Of Elements And Periodicity In Properties

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Question : 20 of 53

Marks: +1, -0

The species Ar, K‌+ and Ca‌2+ contain the same number of electrons. In which order do their radii increase ?

[NEET 2015 C]

Ca2+<Ar<K+
Ca2+<K+<Ar
K+<Ar<Ca2+
Ar<K+<Ca2+

Solution:

In isoelectronic species
Atomic radius Atomic radius ∝

1

Zeff

hence increasing order of radius is$ Ca^{+2}

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