|Themes > Science > Chemistry > Inorganic Chemistry > More Information about Chemical Bonding > Chemical Bonding Index > Valence and core electrons|
A typical electron configuration looks something like this
Electronic configurations that are the same as noble gases are very stable. The electrons in the 1s orbital on carbon do not take part in bonding: they are the core electrons. The valence electrons are what is left: the 2s22p2 part are the valence electrons: these do bond.
In calcium, everything in the argon-like closed shell are the core electrons. The valence electrons are the 2 electrons in the 4s orbital.
Example: What are the core and valence electrons in cobalt?
Solution: Start by writing the electron configuration of cobalt, atom 27