Classification of Elements and Periodicity in Properties - Result Question 12

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

[2015]

(a) Ca2+<Ar<K+

(b) Ca2+<K+<Ar

(c) K+<Ar<Ca2+

(d) Ar<K+<Ca2+

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Solution:

(b) In isoelectronic species the radius decrease with increase in nuclear charge hence increasing order of radius is Ca+2<K+<Ar



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