The horizontal rows on the periodic table are called?

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Multiple Choice

The horizontal rows on the periodic table are called?

Explanation:
Horizontal rows are called periods. This name reflects that each period corresponds to a new principal energy level (electron shell) being filled as you move from left to right across the table, so elements in the same period have the same number of electron shells. As you go down a column, you’re not changing the number of shells in the same way; instead you’re repeating similar properties, which is why those vertical columns are called groups or families. The term blocks refers to the orbital type being filled (s-block, p-block, d-block, f-block) and isn’t about the row direction.

Horizontal rows are called periods. This name reflects that each period corresponds to a new principal energy level (electron shell) being filled as you move from left to right across the table, so elements in the same period have the same number of electron shells. As you go down a column, you’re not changing the number of shells in the same way; instead you’re repeating similar properties, which is why those vertical columns are called groups or families. The term blocks refers to the orbital type being filled (s-block, p-block, d-block, f-block) and isn’t about the row direction.

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