The horizontal row on the periodic table is called?

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Multiple Choice

The horizontal row on the periodic table is called?

Explanation:
The horizontal row on the periodic table is called a period. Rows are periods, while columns are groups (or families). Periods show elements that have the same number of electron shells; as you move left to right across a period, the outer electrons occupy the same shell, but the increasing nuclear charge changes properties gradually. Groups, on the other hand, are vertical columns where elements share similar valence electron arrangements and similar chemical behavior. So the right term for the horizontal row is period.

The horizontal row on the periodic table is called a period. Rows are periods, while columns are groups (or families). Periods show elements that have the same number of electron shells; as you move left to right across a period, the outer electrons occupy the same shell, but the increasing nuclear charge changes properties gradually. Groups, on the other hand, are vertical columns where elements share similar valence electron arrangements and similar chemical behavior. So the right term for the horizontal row is period.

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