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Stack #504944
chapter 12 vocabulary (periodic tabel)
Question | Answer |
---|---|
periodic | discribes something that ocours or repets at regular intervals |
periodic law | the law that states that the repeting chemical and physical properties of elements change periodicaly with the atomic numbers of the elements |
period | in chemistry a horizantial row of elements in the periodic tabel |
group | a vertical colume of elements in the periodic tabel; elements in a large group share chemical properties |
alkali metals | one of the elements of group 1 in the periodic tabel (lithium,sodium,pottasium,rudibium,cesium,and francium) |
alkaline-earth metal | one of the elements of grooup 2 of the periodic tabel(beryllium,magnisium,calcium,strontium,barium,andradium) |
halogen | one of the elements of group 17 on the periodis tabel(fluorine,chlorine,borime,and astatine)halogens combine with most metals to form salt |
noble gas | one of the groups 18 of the periodic tabel(helium,neon,argon,kripton,xenon,and radon)noble gasses are unreactive |