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...Continue valency of all elements the periodic table shown on left can tell us a great deal about are placed in groups columns according to number valence electrons so naturally position element should give an idea its group have electron they as will tend up this is same for which two and however take do not react nosymbolelementvalence hhydrogen hehelium lilithium beberyllium bboron ccarbon nnitrogen ooxygen ffluorine neneon nasodium mgmagnesium alaluminum sisilicon pphosphorus ssulfur clchlorine arargon kpotassium cacalcium scscandium tititanium vvanadium crchromium mnmanganese feiron cocobalt ninickel cucopper znzinc gagallium gegermanium asarsenic seselenium brbromine krkrypton rbrubidium srstrontium yyttrium zrzirconium nbniobium momolybdenum tctechnetium ruruthenium rhrhodium pdpalladium agsilver cdcadmium inindium sntin sbantimony tetellurium iiodine xexenon cscesium babarium lalanthanum cecerium prpraseodymium ndneodymium pmpromethium smsamarium eueuropium gdgadolinium tbterbiu...