Question

2.
State the number of groups & periods in modern periodic table.​

Answer 1

Answer:

18 groups and 7 periods.

Explanation:

the elements in modern periodic table are arranged in order of increasing atomic number in 18 groups and 7 periods.

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Answer 2

Answer:

there are all total 18 groups and 7 periods in a modern periodic table.

Explanation:

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