Which of the following elements would have the largest atomic radius?
A
Cl
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B
F
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C
Li
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D
Ne
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E
Na
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Solution
The correct option is ENa Option E is the correct answer.
We know that down a group in the periodic table, as atomic number increases, the number of shells increases and hence atomic radius also increases. Along a period, as atomic number increases, the nuclear charge also increases and hence the nuclear force of attraction increases too. Thus, atomic radius decreases along a period. Among the above-mentioned elements, Li and F and Ne belong to the second period. Whereas, Na and Cl belong to the third period.
The third period will have larger atomic radius than the second period since the third period lies below the second period. Moreover, Na lies to the left of the periodic table and Cl lies to the right of the periodic table. Hence Na has the largest atomic radius of the above-mentioned elements.