The Average Atomic Mass of Zirconium Is ​

Multiple Choice

The average atomic mass of zirconium is ​
​
Isotope
Natural abundance
A
⁹⁰Zr
52%
B
⁹¹Zr
11%
C
⁹²Zr
17%
D
⁹⁴Zr
17%
E
⁹⁶Zr
3%
​

A) less than 90 because the atomic mass only depends on the number of protons in the atom.
B) 90 because ⁹⁰Zn has the highest natural abundance.
C) greater than 90 but less than 96 because the atomic mass takes into account the abundance of all naturally occurring isotopes.
D) 96 because the atomic mass is the mass of the highest naturally occurring isotope.
E) greater than 96 because the atomic mass is the sum of masses of the naturally occurring isotopes.