Periodic Table and Periodicity (Hard)

Casual Mode - Take your time!

1 / 15
✓
Correct
0
✗
Incorrect
0
★
Score
0%
Multiple Choice

Which of the following elements were placed correctly in Mendeleev’s periodic table?

  1. Argon and potassium
  2. Cobalt and nickel
  3. Tillerium and iodine
  4. Oxygen and fluorine
Change Mode