Question

What is periods and periodicity ?​

Answer 1

The recurring part of non-terminating recurring decimal is called the 'period' and the number of digits in the recurring part is called 'periodicity'

Answer 2

This arrangement is called the periodic table. The columns of the periodic table are called groups. Members of the same group in the table have the same number of electrons in the outermost shells of their atoms and form bonds of the same type. The horizontal rows are called periods.

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