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Which was the first transuraniumactinoid element to be discovered?

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in Chemistry – Class 12 by (188k points)
Which was the first transuraniumactinoid element to be discovered?

(a) Neptunium

(b) Americium

(c) Protactinium

(d) Actinium

The 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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