Question

what is the number of period in modern periodic table

Answer 1

7 periods.
hope it will help you if you

Answer 2

There Are 7 Periods In the Modern Periodic Table.

EXTRA:
Well if Any more elements will be discovered then those will be shifted to the 8th Period. Because till now only 118 element has been known. And dunno about Ununennium. btw Ununennium is the 119th element and 120th element is Ununbinilium. Not sure about the two elements but there are 118 elements in the periodic table.

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