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chapter 12 vocab-perodic table
Term | definition |
---|---|
Periodic | describes something that occurs or repeats at a regular intervals |
periodic law | the law that states that the repeating chemical and physiacal propeties of elements change periodically with the atomic numbers of the element |
Period | in chemistry a horizontal row of elements in the periodic table |
group | a vertical column of elements in a group share chemical properties |
Alkali metal | one of the elemants 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(fluoribe,chlorine,bromine,iodine,and astatine); halogens combine with most matals to form salts |
noble gas | one of the elements of group 18 of the periodic table(helium,neon,agron,krpton,xenon,and radon);noble gases are unreactive |