Which of the following sets of elements are arranged in o...
Which of the following sets of elements are arranged in order of decreasing atomic size in the Periodic Table?
6C, 4Be, 7N,8 O
4Be,6 C,7 N,8 O
8O, 7 N, 6C, 4Be
7N, 8O, 6C,4Be
Correct answer is B
4Be, 6C, 7N, 8O is the answer because atomic size decreases across the period and increases down the group due to the effect of the positively charged nucleus./ increasing atomic numbers.
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