Lithium Forms Compounds Which Are Used in Dry Cells and Storage

question 46

Multiple Choice

Lithium forms compounds which are used in dry cells and storage batteries and in high-temperature lubricants. It has two naturally occurring isotopes, ⁶Li (isotopic mass = 6.015121 amu) and ⁷Li (isotopic mass = 7.016003 amu) . Lithium has an atomic mass of 6.9409 amu. What is the percent abundance of lithium-6?

• A)92.50%
• B)86.66%
• C)46.16%
• D)7.503%
• E)6.080%

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Definitions:

Exposure Status

The classification of individuals based on their encountered level of a particular factor, substance, or environmental condition that may influence their health.

Incidence

The number of new cases of a disease that occur in a specified population within a given time period.

Cohort Study

An observational study design that follows a defined group of people (a cohort) over time to assess how their exposures affect their outcomes, useful for identifying risk factors and causation.

Cardiovascular Disease

A class of diseases that involve the heart or blood vessels, including coronary artery disease, hypertension, heart failure, and stroke.