Definitions
There is 1 meaning of the phrase
Atomic Number 89.
Atomic Number 89 - as a noun
A radioactive element of the actinide series; found in uranium ores
Synonyms (Exact Relations)
acactinium12Example Sentences
"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."
