ATOMIC NUMBER 89

(noun)

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There is 1 meaning of the phrase Atomic Number 89.

Synonyms (Exact Relations)

"The atomic number 89 belongs to the element actinium."

"Actinium has the atomic number 89."

"Actinium-229 is the most stable isotope with atomic number 89."

"The atomic number 89 comes after atomic number 88 (radium) and before atomic number 90 (thorium)."

"The atomic symbol for the element with atomic number 89 is Ac."