What is defined as a horizontal row of elements in the periodic table?

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Multiple Choice

What is defined as a horizontal row of elements in the periodic table?

Explanation:
Horizontal rows on the periodic table are called periods. A period represents the same principal energy level being filled by electrons, so every element in a period has the same number of electron shells. As you move across a period, the atomic number increases and properties shift from more metallic to more nonmetallic. Vertical columns, by contrast, are groups (or families).

Horizontal rows on the periodic table are called periods. A period represents the same principal energy level being filled by electrons, so every element in a period has the same number of electron shells. As you move across a period, the atomic number increases and properties shift from more metallic to more nonmetallic. Vertical columns, by contrast, are groups (or families).

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