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Ch 12 Vocabulary
Chapter 12 Vocabulary Terms
| Question | Answer |
|---|---|
| periodic | Describes something that happens at regular intervals |
| periodic law | The law that states that the repeating physical and chemical properties of elements change periodically (across a period) 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; Elements in a group share chemical properties |
| alkali metal | Family Name of the elements in group 1 of the Periodic Table; most reactive metals |
| alkaline-earth metal | Family Name of the elements in group 2 of the Periodic Table; less reactive then the alkali metals |
| halogen | Family Name of the elements in group 17 of the Periodic Table; combine with most metals to form salts |
| noble gas | Family Name of the elements in group 18 of the Periodic Table; unreactive non-metals |