Template:Infobox atom
| Atom | |
|---|---|
 A drawing of the helium atom, showing the nucleus (pink) and the electron cloud (black). The nucleus is made of two protons (red) and two neutrons (violet). The black bar is one angstrom (10−10 m or 0.1 nm). | |
| Properties | |
| Mass range | 1.67×10−27 to 4.52×10−25 kg |
| Diameter range | 62 pm (He) to 520 pm (Cs) (data page) |
| Components | Electrons and a compact nucleus of protons and neutrons |