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chp.12

QuestionAnswer
periodic describes something that occurs or repeats at regular intervals
periodic law the law that statesthat the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements.
period in chemistry, a horizontal row of elements in the periodic table.
group a vertical column of elements in the periodic table
alkali metal one of the elements of group 1 of the periodic table.
alkaline-earth metal one of the elementsof group 2 of the periodic table.
halogen one of the elements of group 17
noble gas one of the elements of group 18.
Created by: 218647
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