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Statement (A) : Modern periodic table contains 7 periods.
Statement (B) : Modern periodic table contains 18 groups.
Statement (C) : Second period contains 8 elements.

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A and B are incorrect but c is correct.

A and B are correct but c is incorrect.

All the above statements are correct

All the above statements are incorrect

answer is A.

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Detailed Solution

In the modern periodic table there are 7 horizontal rows and 18 vertical columns are present. Horizontal rows are called periods, Vertical columns are called groups. In the 2^nd period 8 elements are present, those are

Li, Be, B, C, N, O, F and Ne.

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