The Average Atomic Mass of Zirconium Is ​

question 85

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.

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