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An illustration of the helium atom, depicting the nucleus (pink) and the electron cloud distribution (black). The nucleus (upper right) in helium-4 is in reality spherically symmetric and closely resembles the electron cloud, although for more complicated nuclei this is not always the case. The black bar is one angstrom (10−10 m or 100 pm).
|Smallest recognized division of a chemical element|
|Mass range||1.67×10−27 to 4.52×10−25 kg|
|Electric charge||zero (neutral), or ion charge|
|Diameter range||62 pm (He) to 520 pm (Cs) (data page)|
|Components||Electrons and a compact nucleus of protons and neutrons|