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1. What are the "periods of the Periodic Table?
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1. What are the "periods of the Periodic Table?

User Jim Noellsch
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Answer:

Columns in going side to side

Step-by-step explanation:

User Bret Deasy
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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.
User Salt
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