Atomic size refers to the radius of an atom. It is the distance from the centre of the atom to the outermost orbit. Arrange the elements Li, Na, K according to their atomic sizes.

K > Na < Li

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Li > Na > K

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Li < Na > K

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K > Na > Li

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Solution

The correct option is D K > Na > Li
Li, Na, K belong to group - I of the periodic table. The size of the atom increases gradually as we move from top to bottom. This is because a new shell gets added to the atom as we move from one element to the next in the same group.

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