Question

What are period and groups. Explain 7 period in the Modern periodic table.​

Answer 1

Answer:

Periods are the horizontal rows in the modern periodic table whereas groups are the vertical columns in the modern periodic table. There are 18 groups and 7 periods in the modern periodic table. The elements in a group have the same number of valence electrons and the elements in a period have the same number of valence shells.

Answer 2

Answer:

refer to attachment ☝️☝️

Explanation:

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