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The columns in the periodic table are also called a. sets. b. periods. c. families. d. energy levels
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Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?
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Asubstance is a good conductor of electricity which of the following best explains a probable position of the substance in a periodic table
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The columns in the periodic table are also called a. sets. b. periods. c. families. d. energy levels...
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