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periodic table
| TERM | DEFFINITION |
|---|---|
| PERIODIC | describes somthing that occurs or repeats at regular intervals. |
| PERIODIC LAW | in the law that states that the repeating chemical and physical properties of elements change periodiclly 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 propeties. |
| ALKALI METAL | one of the elements of group 1 of the periodic table (litium,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 astatine);halogens combine with most metals to form salts. |
| NOBLE GAS | one of the elements of group 18 of the periodic table (hlium,neon,argon,kypton,xeneon,and randon);npble gases are unreactive. |