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  4. Which of the following has largest ionic radius?

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Q. Which of the following has largest ionic radius?

VMMC MedicalVMMC Medical 2005

Solution:

Atomic and ionic radii increase from top to bottom in a group due to the inclusion of another shell at every step. Hence $ \text{C}{{\text{s}}^{\text{+}}} $ ion will be the largest among given IA group ions $ \text{(N}{{\text{a}}^{+}}\text{,L}{{\text{i}}^{+}}\text{and }{{\text{K}}^{+}}\text{)} $