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http://en.wikipedia.org/wiki/Periodic_table

groups or families are vertical

A period is a horizontal row in the Periodic Table. Although groups are the most common way of classifying elements, there are some regions of the periodic table where the horizontal trends and similarities in properties are more significant than vertical group trends.

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14y ago
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7y ago

The columns on the periodic table are called GROUPS. The rows are called periods.

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11y ago

Groups

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Q: What are the columns on the periodic table called?
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