Question

how many periods are there in the long form of period table​

Answer 1

Answer:

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Answer 2

Seven Periods

A period is a horizontal row of the periodic table. There are seven periods in the periodic table, with each one beginning at the far left. A new period begins when a new principal energy level begins filling with electrons. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements.