[DOC] [TLE] Chemistry Flashcards | Quizlet [PAR] THE ELEMENTS---An 18-karat gold alloy consists of this percentage of gold. 75. 
.... THE PERIODIC TABLE---Co doesn't stand for columbium but rather for this 
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... [DOC] [TLE] Niobium - Element information, properties and uses | Periodic Table [PAR] Element Niobium (Nb), Group 5, Atomic Number 41, d-block, Mass 92.906. 
Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and... [DOC] [TLE] Osmium - Element information, properties and uses | Periodic Table [PAR] Element Osmium (Os), Group 8, Atomic Number 76, d-block, Mass 190.23. 
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Question: Co doesn't stand for columbium but rather for this element used mostly in making alloys
Answer: Cobalt