Question

write periods in periodic table​

Answer 1

Answer:

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.

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Answer 2

Answer:

✒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.

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