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Q. Which one of the following atoms will have largest size?

ManipalManipal 2015

Solution:

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.