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A period is a row and what is a group that is a column
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A period is a row and what is a group that is a column

User Delany
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Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period. Beside above, what do columns mean in the periodic table? The periodic table also has a special name for its vertical columns.

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