atomic number 91

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Definitions from WordNet

Noun atomic number 91 has 1 sense

protactinium, protoactinium, Pa, atomic number 91 - a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
--₁ is a kind of metallic element, metal

Definitions from the Web

Atomic number 91

Noun

The atomic number 91 refers to the unique number that identifies an element called protactinium, which is a rare, silvery-gray metal.

Sample sentence: The atomic number 91 corresponds to the element protactinium in the periodic table.

Adjective

An atomic number 91 substance is used to describe any material relating to or derived from protactinium.

Sample sentence: The researcher conducted experiments using an atomic number 91 compound.

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