Name:
LET’S EXPLORE CHEMISTRY
Instructions: Use technology and teacher provided resources to help you answer the
following questions and prompts.
History of the Periodic Table: Watch the TedEd “The genius of Mendeleev’s periodic table.”
Answer the questions below about this TedEd.
1. Who invented the modern periodic table? (first and last name)
2. According to the video, why did the 1870s table have “placeholders”?
3. What are two things that Mendeleev concluded about the undiscovered
“eka-aluminum”? And, how did he figure these things out?
4. According to the video, what was isolated in 1937?
Dynamic Periodic Table: Navigate to the “Dynamic Periodic Table” website. Use it to answer
the following questions.
5. Click on hydrogen. What is the…
a. … atomic weight?
b. … color?
c. … meaning in Greek?
d. … boiling point (in °C)?
6. Click the “X” in the top right hand corner. Now, click on helium. What is…
a. … the color?
b. … a commercial use for it?
c. … a way that new helium is created?
7. Go back to the table. Which elements are the “noble gases”? Write the names of all of
the noble gases.
8. Use google to answer: how are the noble gases difference from the other elements?
(you must use the word “stable” somewhere in your answer)
9. Which elements are the halogens? Write the names of all of the halogens.
10. Go back to the dynamic periodic table. Notice that there is a slider in the top right hand
corner. This will tell you what elements are in what phase (solid, liquid, gas) at each
temperature.
a. At 0 Kelvin, what is the only element that’s in liquid form?
b. At 5845 Kelvin, what is the only element that’s in liquid form?
c. Why are elements 104-118 grayed out?
11. Navigate to the “Khan Academy: Periodic table, electron shells, and orbitals” reading.
As you read it, answer the following questions.
a. Where, in each element’s square, is the atomic number written?
b. What is the electron shell closest to the nucleus called and how many electrons
can it hold?
c. What is the name for any element’s outermost shell?
d. What is the “octet rule”?
12. For the following elements, draw their Bohr model diagram.
Carbon
13. Why do scientists say Bohr models aren’t actually great representations of electron
orbitals? Prove your point by drawing what some orbitals actually look like.