What’s an Atom

Families Vs. Periods (Rows versus Columns) 1. Rows/Periods. are called . periods. are horizontal (side to side) elements in the same row/period DO NOT have common properties . there are 7 of them on the periodic table. 2. Columns/Groups. are called . groups or families. are vertical (up and down) elements in the same group/family DO have common ... ................
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