How many periods and groups are present in the periodic table?

How many periods and groups are present in the periodic table?

Q. How many periods and groups are present in the periodic table?

A.            7 periods and 18 groups

B.            8 periods and 7 groups

C.            7 periods and 7 groups

D.            8 periods and 8 groups

Answer: 7 periods and 18 groups

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