Zinc Has Five Naturally Occurring Isotopes with an Average Mass

question 73

Multiple Choice

Zinc has five naturally occurring isotopes with an average mass of 65.39 amu. Three isotopes, in roughly equal amounts, account for 95% of zinc. Which isotope is most abundant?

• A)(⁶⁴Zn, 63.9291 amu)
• B)(⁶⁶Zn, 65.9260 amu)
• C)(⁶⁷Zn, 66.9271 amu)
• D)(⁶⁸Zn, 67.9249 amu)
• E)(⁷⁰Zn, 69.9253 amu)

---

Definitions:

First Session

The initial meeting or encounter in a series, often setting the tone and direction for future interactions.

Last Session

The final meeting or therapy session between a therapist and their client, often used to review progress, discuss future plans, and provide closure.

Assessment

The process of evaluating or estimating the nature, ability, or quality of something.

Mental Health Diagnosis

The process of determining through examination and analysis, which mental disorder explains a person's symptoms and behaviors.