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K.L. chapter 12
Periodic Table
| Vocabulary word | Definition |
|---|---|
| Periodic | Describessomthing that occurs 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 of elements in the periodiic table. |
| Group | A vertical column of elements in the periodic table; elements in a group share chemical properties. |
| Alkali metal | One of the elements of group 1 of the periodic table (lithium,sodium,potassium,rubidium,cesium,and francium.) |
| Alkaline-earth metal | One of the elements of group 2 of the periodic table (beryllium,magnesium,calcium,strontium, barium, and radium.) |
| Halogen | One of the elements of group 17 of the periodic table (florine,chlorine,bromine,iodine,and asatine); halogens combine with most metals to form salts. |
| Nobel gas | One of the elements of group 18 of the periodic table (helium,neon,argon,krypton,xenon,and randon); nobel gases are unreactive. |