rutherfordium

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rutherfordium (symbol Rf) Synthetic, radioactive, metallic element, first of the transactinide elements. The longest-lived of its ten isotopes has a half-life of 70 seconds (the longest yet identified). It is named after the New Zealand-born British physicist Ernest Rutherford. Properies: at.no. 104. It was first given the temporary name of unnilquadium until 1997.

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