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The columns in the periodic table are also called A. sets. B. periods. C. families. D. energy levels

User Olmo
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The columns in the periodic table are also called C. Families.
User Mohy Eldeen
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it depends if you are talking about the ones that go up or down
or left and right

the ones that go up and down are called groups

the onesthat go left and right are periods
The columns in the periodic table are also called A. sets. B. periods. C. families-example-1
User Thekidder
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