Which of the Following Does Not Have at Least One

question 64

Multiple Choice

Which of the following does not have at least one, very long- lived, natural, radioactive isotope?

• A) Ca; calcium
• B) Rb; rubidium
• C) K, potassium
• D) Th; thorium

---

Definitions:

Marginal Tax Rates

The rate at which an additional dollar of income is taxed, showing the percentage of tax applied to your income for each tax bracket you pass through.

Laffer Curve

A theoretical representation of the relationship between tax rates and government revenue, suggesting there is an optimal tax rate that maximizes revenue.

Tax Revenue

The financial earnings that governments obtain through taxation.

Price Ceiling

A legally imposed limit on the price that can be charged for a good or service.