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A period is a horizontal row in the Periodic Table. So far, there are 7 of them. Each period shows patterns as you go across it(left to right). On of the must-know patterns is that the number of period indicates how many orbitals (or energy levels) the elements in that period have. Other patterns include atomic radius and ionic radius.

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Ashlee Farrell

Lvl 13
3y ago

What else can I help you with?