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Images 194 of 282 - Nucleus
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    Nucleus
Description:
At the centre of an atom lies a nucleus, which consists of protons and neutrons. Because protons have a positive charge and neutrons have no charge, the overall charge of a nucleus is positive. The charge of a nucleus is balanced out by negatively charged electrons, which are arranged around it in shells. The charge of one proton is cancelled out by the charge of one electron - they have equal but opposite charges. In a stable atom, the overall charge is zero, meaning that there is an equal number of protons and electrons.
17 of 24 pages
Diamond
Nucleus
Proton
Neutron
Star Distances
Constellation of Orion
Nebula
Main-sequence Star
Red giant
Supergiant
Supernova
Planetary nebula