An Element Consists of Three Isotopes

question 44

Multiple Choice

An element consists of three isotopes.The abundance of one isotope is 92.21% and its atomic mass is 27.97693 u.The abundance of the second isotope is 4.70% and its atomic mass is 28.97649 u.The atomic mass of the third isotope is 29.97376 u.What is the atomic weight of the element?

• A) 28.09 u
• B) 28.98 u
• C) 28.96 u
• D) 29.87 u
• E) 29.07 u

---

Definitions:

Case Study

An in-depth investigation of a single individual, group, event, or community, typically used in psychology to examine and illustrate broader principles or phenomena.

Reliability

The degree to which an assessment tool produces stable and consistent results over time.

Aggregate Measurements

A type of measurement that combines data from multiple sources or individuals to provide a collective or summary measure.

Error Variance

Error variance refers to the portion of variability in a set of data that results from factors other than the independent variable, often attributed to random or uncontrolled variables.