Over the Course of 6 Hours,15% of a Radioactive Material

question 29

Multiple Choice

Over the course of 6 hours,15% of a radioactive material decays.What is its half-life?

• A) 12.8 hrs
• B) 25.6 hrs
• C) 4.1 hrs
• D) 68.6 hrs

---

Definitions:

Lewis Dot Structure

A diagram showing the bonding between atoms of a molecule and the lone pairs of electrons in the molecule.

Chlorine

A toxic, greenish-yellow gas with a strong odor, used as a disinfectant and in the manufacture of various chemicals.

Calcium

A chemical element with the symbol Ca and atomic number 20, an essential component of bones, teeth, and shells, and plays a crucial role in cell signalling.

Chlorine

A chemical element with symbol Cl and atomic number 17, known for its strong oxidizing properties and use as a disinfectant.