Zirconium, a transition element with an atomic number of 40, has several isotopes, and each has a different mass number. Zr-88 (mass number 88), Zr-89 (mass number 89), Zr-90 (mass number 90), Zr-91 (mass number 91), Zr-92 (mass number 92), Zr-93 (mass number 93), Zr-94 (mass number 94) and Zr-96 (mass number 96).
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Zirconium can exist as one atom while one atom of zirconium consists of 40 protons, 40 electrons and 56 neutrons.
The atomic mass of zirconium is approximately 91.224 grams per mole.
zirconium, Zr
The element with an atomic mass of 40.1 is calcium (Ca).
The atomic mass of Zirconium (Zr) is approximately 91.22 grams per mole.
The atomic number of zirconium (Zr) is 40.The atomic weight of Zr is 91.224 grams per mole.See the Web Links to the left of this answer for a periodic table with more information about this element!