Question

explain the structure of modern periodic table​

Answer 1

Answer:

There are 18 vertical columns in the periodic table. Each column is called a group. All elements in a group have similar chemical and physical properties because they have the same number of valence electrons. Periods - In periodic table elements are arranged in a series of rows.

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Answer 2

Answer:

Groups - There are 18 vertical columns in the periodic table. Each column is called a group. All elements in a group have similar chemical and physical properties because they have the same number of valence electrons. Periods - In periodic table elements are arranged in a series of rows.

Explanation: