Multiple choice

Atoms of which of the following elements exist independently?

  1. Hydrogen

  2. Nitrogen

  3. Helium

  4. Oxygen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Helium is a noble gas, which means its outer electron shell is full, making it stable enough to exist as a single atom. Hydrogen, nitrogen, and oxygen typically exist as diatomic molecules.

Keep practicing — related questions