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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?

Bihar CECEBihar CECE 2006Classification of Elements and Periodicity in Properties

Solution:

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