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Chapter 12 Vocab.
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 |
gruop | 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,berium, and radium) |
halogen | one of the elements of GROUP 17 of the periodic table (fluroine,chlorine,bromine,iodine, and astatine);halogens combine with most metals to form salts |
noble gas | one of the elements of GROUP 18 of the periodoic table (helium,neon,argon,kypton,xeon, and radon); noble gases are unreactive |