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Which of the following atoms will have the smallest size?

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Which of the following atoms will have the smallest size?

(a) Mg 

(b) Na

(c) Be 

(d) Li

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1 Answer

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Best answer

The correct option is: (c) Be

Explanation:

The atomic size decreases within a period from left to right, therefore Li > Be and Na > Mg. The size increases in a group from top to bottom. Hence, the size of Na is greater than Li. Overall order Na > Mg > Li > Be 

Thus, Be has smallest size.

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