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OpenStudy (anonymous):

what is horizontal rows on periodical table called

3 years ago
OpenStudy (kainui):

The horizontal rows of the periodic table are called periods. Why? Because they repeat themselves periodically. Everything in the last column are inert gases. The column right before that has halogens. So when you finish a row and start over you are essentially going through the same pattern of stuff periodically.

3 years ago
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