Question

give the notes of periodic classification for 7th class​

Answer 1

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In periodic table, elements have been arranged by increasing atomic number. Horizontal rows on the periodic chart are called periods. There are seven rows in the periodic table. Each row is called a period. The periods have been numbered from 1 to 7. The first period is the shortest period of all and contains only 2 elements, H and He.

Answer 2

Answer:

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Explanation:

In periodic table, elements have been arranged by increasing atomic number. Horizontal rows on the periodic chart are called periods. There are seven rows in the periodic table. Each row is called a period. The periods have been numbered from 1 to 7. The first period is the shortest period of all and contains only 2 elements, H and He.