A) \[Ar+{{K}^{+}}<C{{a}^{2+}}\]
B) \[C{{a}^{2+}}<Ar<{{K}^{+}}\]
C) \[C{{a}^{2+}}<{{K}^{+}}<Ar\]
D) \[{{K}^{+}}<Ar<C{{a}^{2+}}\]
Correct Answer: C
Solution :
\[C{{a}^{2+}}\,<{{K}^{+}}\,<Ar\] \[Ar,{{K}^{+}}\] and \[C{{a}^{2+}}\] are isoelectronic i.e. with same number of electrons, 18. For isoelectronic species ionic radii decreases with increase in effective (relative) positive charge. Also \[Ar,\,K\] and \[Ca\] belong to the same period (3rd period).You need to login to perform this action.
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