Multiple choice

Which of the following is not a noble gas?

  1. Hydrogen

  2. Helium

  3. Argon

  4. Neon

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

Hydrogen is not a noble gas. The noble gases make a group of chemical elements with similar properties. Under standard conditions, they are all odourless, colourless, monatomic gases with very low chemical reactivity. The six noble gases that occur naturally are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe) and the radioactive radon (Rn).