Question

How many group and periods are there in modern periodic table.​

Answer 1

Answer:

Explanation:

There are currently seven complete periods in the periodic table, comprising the 118 known elements. Any new elements will be placed into an eighth period; see extended periodic table.

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Answer 2

Answer:

18 groups and 7 periods

Explanation:

In the periodic table, there are 7 periods and 18 groups.