Definitions
There is 1 meaning of the phrase
Atomic Number 91.
Atomic Number 91 - as a noun
A short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
Synonyms (Exact Relations)
pa4protactinium18protoactinium19Example Sentences
"Protactinium is an element with atomic number 91."
"The atomic number 91 corresponds to protactinium."
"Scientists use the atomic number 91 to identify protactinium."
"The atomic number 91 indicates the number of protons in a protactinium atom."
"The atomic number 91 belongs to the element protactinium."
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Phrases
atomic number 109
