Multiple choice

The element with largest atomic size in period 2 is:

  1. boron

  2. nitrogen

  3. fluorine

  4. beryllium
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D Correct answer
Explanation

On moving from left to right, the atomic size decreases due to increase in effective nuclear charge. From amongst the given elements, these occur in period 2 of periodic table in the order- beryllium, boron, nitrogen and fluorine (atomic numbers 4, 5, 7 and 9 respectively). Thus, atomic size decreases from beryllium to fluorine. Hence, beryllium has largest atomic size amongst the given elements.

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