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...Name class date given due in the periodic table complete sentences below using words from box periods groups atoms elements natural shows over naturally occurring is organised horizontally into vertically use to answer questions a two metals b non c noble gases d group e compare and contrast patterns of reactivity answers any left side see key right helium neon argon krypton xenon radon beryllium magnesium calcium strontium barium radium oxygen sulphur selenium tellurium polonium max become more reactive down react with water lithium fizzes rubidium explodes description element observed least francium most opposite less fluorine astatine...