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Chapter 12. Vocab.
Question | Answer |
---|---|
periodic | describes something that occurs or repeats at regular intervals |
periodic table | the law that states that 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 elements of Group 2 of the periodic table |
halogen | one of the elements of Group 17 of the periodic table; halogens combine with most metals to form salts |
noble gas | one of the elements of the group 18 of the periodic table; noble gases are unreactive |