Horizontal row on the periodic table is called a

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Multiple Choice

Horizontal row on the periodic table is called a

Explanation:
Horizontal rows on the periodic table are called periods. As you move across a period from left to right, electrons are added to the same principal energy level, so the valence shell stays the same level while its electrons are rearranged. This creates a repeating pattern of properties as you go from one period to the next when a new shell begins to fill. In contrast, vertical columns are groups (also called families) and reflect similar valence electron configurations, while a block refers to a section of the table defined by the type of orbital being filled (s, p, d, or f), not the row. So the horizontal row is the period.

Horizontal rows on the periodic table are called periods. As you move across a period from left to right, electrons are added to the same principal energy level, so the valence shell stays the same level while its electrons are rearranged. This creates a repeating pattern of properties as you go from one period to the next when a new shell begins to fill. In contrast, vertical columns are groups (also called families) and reflect similar valence electron configurations, while a block refers to a section of the table defined by the type of orbital being filled (s, p, d, or f), not the row. So the horizontal row is the period.

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