Articles > Carbon definition – quiz Carbon definition – quiz Quiz Choose the best answer. 1. Which of the following is not a property of carbon? A nonmetal Atomic number of 6 A trivalent 2. A radioisotope of carbon Carbon-12 Carbon-13 Carbon-14 3. Natural organic compounds Sugars Diamonds Plastics 4. Inorganic compound Carbohydrate Carbon dioxide Carbon 5. Any of the carbon-based compounds that may move to soil, sediment, and water Pure element Inorganic compound Organic matter Send Your Results (Optional) Your Name To Email Time is Up!