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physical science!
The Periodic Table
| term | definition |
|---|---|
| Periodic | Describes something 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 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 | 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). |
| Halogens | One of the elements of Group 17 of the periodic table (fluorine, 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 (helium, neon, argon, kryponton, xenon, and radon); noble gases are unreactive. |