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periodic table
| Question | Answer |
|---|---|
| periodic | describes something that occurrs or repeats at regular intervals |
| periodic law | 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 a 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 metals | one of the elements of group 2 of the periodic table |
| halogen | one of the elemnts of group 17 of the periodic table; halogens combine with most metals to form salt |
| noble gas | one of the elements of group 18 of the periodic table; noble gases are unreactive |