Final answer:
If the atomic number of an element is 89, it is an Inner transition element.
Step-by-step explanation:
If the atomic number of an element is 89, it is an Inner transition element. Inner transition elements are located in the f-block of the periodic table and include the lanthanides and actinides. They have atomic numbers falling between 57 and 71 (for lanthanides) and 89 and 103 (for actinides).
Learn more about Inner transition elements