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Stack #504951

Chapter 12 Vocab.

TermDefinition
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
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