Radioactivity Was First Discovered in Salts of Which of the Following

question 77

Multiple Choice

Radioactivity was first discovered in salts of which of the following elements?

• A) sodium
• B) radium
• C) radon
• D) uranium

---

Definitions:

Life Expectancy

The average period that a person is expected to live, based on statistical measures that correlate with current mortality rates.

Labor Participation

The percentage of the working-age population that is either employed or actively looking for work.

Spousal Earnings

The income generated by one's spouse or partner, often considered in the analysis of household income and dynamics.

Married Persons

Refers to individuals who are legally united in marriage, which can affect tax statuses, legal benefits, and financial liabilities.