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Which was the first transuraniumactinoid element to be discovered?(a) Neptunium(b) Americium(c) Protactinium(d) ActiniumThe question was asked in quiz.My question is from D and F-Block Elements topic in portion D and F-Block Elements of Chemistry – Class 12

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The CORRECT CHOICE is (a) Neptunium

For explanation: Neptunium was the first transuranium element to be discovered in 1940. It is a silvery metal, with a MELTING POINT of 637°C and a boiling point of 4174°C. It exhibits oxidation states of +3 to +7 in compounds and useful for chemical experiments.



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