Which of the following gives the correct decreasing order of atomic radii of the given elements of second period?
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A.
B < Be < N < O
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B.
Be > B > N > O
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C.
Be < B < O < N
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D.
Be < B < N < O
Correct Answer:
D. Be < B < N < O
Explanation:
In the second period of the periodic table, atomic radii decrease from left to right as the effective nuclear charge increases, pulling electrons closer to the nucleus. The elements given are Beryllium (Be), Boron (B), Nitrogen (N), and Oxygen (O). Since atomic size decreases as you move across the period, Be has the largest radius, followed by B, then N, and finally O. Therefore, the correct decreasing order of their atomic radii is Be > B > N > O.
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