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( Pt is the world's most expensive metal, $ 1600 CAD per ounce). (Fr is radioactive and explodes in water). (Se is the active ingredient in dandruff shampoos).
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(Pt is the world's mostexpensive metal, $1600 CAD per ounce) (Fr is radioactive and explodes in water) (Se is the active ingredient in dandruff shampoos)