Question

how many groups are present in modern periodec table​

Answer 1

Answer:

18 groups

A group is a vertical column of the periodic table, based on the organization of the outer shell electrons. There are a total of 18 groups.

Explanation:

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Answer 2

Answer:

A group is a vertical column of the periodic table, based on the organization of the outer shell electrons. There are a total of 18 groups. And there are seven horizontal rows called periods.