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vova2212 [387]
2 years ago
5

What are periods on the periodic table? How many are there?

Chemistry
1 answer:
Brums [2.3K]2 years ago
8 0
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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