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

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Arrangement of oxygen and fluorine was correct in Mendeleev’s periodic table.