Biology, asked by shashisingh1982jsr, 10 months ago

What do u understand by Periods??

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Answered by social53

Answer:

Definition of Period. A period is the name given to a horizontal row of the periodic table. The periodic table has seven periods. Apart from period 1, every period begins with an alkali metal and ends with a noble gas. Period 1 contains only two elements: hydrogen and helium.

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