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The horizontal rows are periods on Periodic Table. There are 7 horizontal rows in modern periodic table.

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Wiki User

10y ago

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More answers

The horizontal rows of the elements in the periodic table are called periods.

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Wiki User

11y ago
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Horizontal rows in the periodic table are called 'periods' numered 1 to 7

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Wiki User

8y ago
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They are called periods.

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Wiki User

13y ago
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groups

srry, it periods oops

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Wiki User

12y ago
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Horizontal rows are known as periods.

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Wiki User

12y ago
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Mt. Pinatubo!

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Anonymous

4y ago
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Q: What are the horizontal rows elements called on a periodic table?
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