Helium atom

A helium atom is a tiny particle that is made up of two parts: two protons and two neutrons. Protons have a positive charge, and neutrons have a neutral charge. Because protons and neutrons are both made up of very small particles called quarks, the two protons and two neutrons stick together. This makes the helium atom very small and very light. Helium is the second most common element in the universe, so you can find helium atoms everywhere!