Changes

[[Image:Atoms1.jpg|right|200px]]

[[Image:Atoms1.jpg|right|200px]]

The '''valence shell''' is the [[electron shell]] which corresponds to the highest value of principal [[quantum number]] in an [[atom]]. The valence [[electron]]s in this shell are on average farther from the [[nucleus]] than other electrons; these are electronc which are directly involved in [[chemical reaction]]s.<ref>http://antoine.frostburg.edu/chem/senese/101/electrons/glossary.shtml</ref>

The '''valence shell''' is the [[electron shell]] which corresponds to the highest value of principal [[quantum number]] in an [[atom]]. The valence [[electron]]s in this shell are on average farther from the [[nucleus]] than other electrons; these are the electrons which are directly involved in [[chemical reaction]]s.<ref>http://antoine.frostburg.edu/chem/senese/101/electrons/glossary.shtml</ref>

[[Category:Chemistry]]

[[Category:Chemistry]]