Template:Infobox atom

Helium atom
Helium atom grund state.
An illustration o the helium atom, depictin the nucleus (pink) an the electron clood distribution (black). The nucleus (upper richt) in helium-4 is in reality spherically symmetric an closely resembles the electron clood, awtho for mair complicatit nuclei this is nae ayeweys the case. The black baur is ane angstrom (6990100000000000000♠10−10 m or 6990100000000000000♠100 pm).
Clessification
Smawest recognised division o a chemical element
Properties
Mass range: 6973167000000000000♠1.67×10−27 tae 6975452000000000000♠4.52×10−25 kg Electric chairge: zero (neutral), or ion chairge Diameter range: 62 pm (He) tae 520 pm (Cs) Components: Electrons an a compact nucleus o protons an neutrons