▁Due ▁to ▁its ▁a for ement ioned ▁properties , ▁it ▁is ▁commonly ▁used ▁in ▁air plan es , ▁golf ▁clubs , ▁and ▁other ▁objects ▁that ▁must ▁be ▁strong , ▁but ▁light weight . ▁ ▁Van ad ium ▁ ▁Van ad ium ▁( V ) ▁is ▁an ▁element ▁in ▁group   5 . ▁Van ad ium ▁is ▁never ▁found ▁in ▁pure ▁form ▁in ▁nature , ▁but ▁is ▁commonly ▁found ▁in ▁comp ounds . ▁Van ad ium ▁is ▁similar ▁to ▁tit an ium ▁in ▁many ▁ways , ▁such ▁as ▁being ▁very ▁cor ros ion - res istant , ▁however , ▁unlike ▁tit an ium , ▁it ▁ox id izes ▁in ▁air ▁even ▁at ▁room ▁temperature . ▁All ▁van ad ium ▁comp ounds ▁have ▁at ▁least ▁some ▁level ▁of ▁to x icity , ▁with ▁some ▁of ▁them ▁being ▁extremely ▁to xic . ▁ ▁Ch rom ium ▁ ▁Ch rom ium ▁( Cr ) ▁is ▁an ▁element ▁in ▁group   6 . ▁Ch rom ium ▁is , ▁like ▁tit an ium ▁and ▁van ad ium ▁before ▁it , ▁extremely ▁resist ant ▁to ▁cor ros ion , ▁and ▁is ▁indeed ▁one ▁of ▁the ▁main ▁components ▁of ▁st ain less ▁steel . ▁Ch rom ium ▁also ▁has ▁many ▁color ful ▁comp ounds , ▁and ▁as ▁such ▁is ▁very ▁commonly ▁used ▁in ▁p ig ments , ▁such ▁as ▁chrome ▁green . ▁ ▁Mang an ese ▁ ▁Mang an ese ▁( M n ) ▁is ▁an ▁element ▁in ▁group   7 . ▁Mang an ese ▁is ▁often ▁found ▁in ▁combination ▁with