Read the story and answer the questions to test your comprehension.
Russian chemist Dmitri Mendeleev put all the different chemical compounds in our world together on the Periodic Table of the Elements in 1869. Ninety-four of the Table's 117 elements occur naturally on Earth, while the rest are man-made.
1. How many of the Periodic Table's elements occur naturally?
- a. 152
- b. 116
- c. 117
2. When was the Periodic Table first assembled?
- a. 1689
- b. 1869
- c. 1986
3. Who compiled the Periodic Table?
- a. Don Marino
- b. Danny Mendeleev
- c. Dmitri Mendeleev