Multiple choice

What is the first element on the Periodic Table?

  1. Oxygen

  2. Mercury

  3. Carbon

  4. Hydrogen

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

Hydrogen is the simplest and lightest element in the universe, consisting of just one proton and one electron. Because its atomic number is 1, it occupies the very first position on the periodic table.