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Lime cat 2 Posted 9 years ago
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Science
Consider all 114 IUPAC element names and their symbols: Iodine has it but not fluorine. Iron has it but not manganese. Sodium has it but not magnesium. Neon has it but not krypton. Barium has it but not bohrium. Einsteinium has it but not rutherdordium. And only europium and gold have it twice. What is it?
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