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Question

Which one of the following atoms will have largest size?

A
Ca
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B
Na
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C
Mg
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D
Be
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Solution

The correct option is C Ca
Atomic size increased down the group and decreases in the period from left to right. If we look at the position of Be,Mg, and Ca then it is observed that they are present in the same column which indicates Ca has a larger size than Be and Mg. Ca is also larger in size compared to Na because it has a higher number of electrons that are present farther from the nucleus.
So, calcium (Ca) is the largest size among given atoms.

Hence, the correct option is A.

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