Question

what are periods? how many periods are there in a modern PERIODIC table​

Answer 1

Answer:

Periods. There are currently seven complete periods in the periodic table, comprising the 118 known elements. Any new elements will be placed into an eighth period; see extended periodic table.

Answer 2

seven

Periods. There are currently seven complete periods in the periodic table, comprising the 118 known elements. Any new elements will be placed into an eighth period; see extended periodic table.

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