Modern periodic table which is a period and group
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Period is horizontal so that would be left to right. Groups would be vertical so that's up and down. I hope that helped you.
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Hyy Dude
Groups and periods are two ways of categorizing elements in the periodic table. 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.
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