Which term describes the horizontal rows on the periodic table?

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Multiple Choice

Which term describes the horizontal rows on the periodic table?

Explanation:
Horizontal rows on the periodic table are called periods. A single row is one period, while all of the horizontal rows together are periods. The term “period” would refer to just one row, so when the question asks for the term describing the rows in general, the plural “periods” is the standard choice. For contrast, vertical columns are groups, and the table’s sections by block are s-, p-, d-, and f-blocks, which relate to the type of orbital being filled.

Horizontal rows on the periodic table are called periods. A single row is one period, while all of the horizontal rows together are periods. The term “period” would refer to just one row, so when the question asks for the term describing the rows in general, the plural “periods” is the standard choice. For contrast, vertical columns are groups, and the table’s sections by block are s-, p-, d-, and f-blocks, which relate to the type of orbital being filled.

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