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periodic table
chapter 12
| Question | Answer |
|---|---|
| periodic | happening at the regular intervals |
| periodic law | the law that states that the repeating chemical and physical properties of elements change periodacally with rhe atomic number of the elements |
| period | each horizontal row of elements on the periodic table |
| group | each vertical column of the elementsm on the periodic table |
| alkali metals | are elements in group one of the periodic |
| alkaline-earth metals | are less reactive than alkali metals are |
| halogen | one of the elements of group 17 of the periodic table,halogens combine with most metals to form salts |