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chp.12
Question | Answer |
---|---|
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. |