atomic number 91

1. 1.

   a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead

   SynonymsprotactiniumprotoactiniumPa

   Broadermetallic element

Questions about atomic number 91

What does atomic number 91 mean?

atomic number 91 means "a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead".

What is another word for atomic number 91?

Close synonyms include protactinium, protoactinium, Pa. Each sense on this page lists its own synonyms, because a word with several meanings rarely has one substitute that works for all of them.

Is atomic number 91 a common word?

atomic number 91 is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.