
In chemistry, delta bonds (δ bonds) are covalent chemical bonds, where four lobes of one involved atomic orbital overlap four lobes of the other involved atomic orbital. This overlap leads to the formation of a bonding molecular orbital with two nodal planes which contain the internuclear axis and go through both atoms. The Greek letter δ in the...
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http://en.wikipedia.org/wiki/Delta_bond

(from the article `chemical bonding`) ...by the cylindrically symmetrical overlap of two orbitals. There are also two bonds formed by the overlap of two appropriately orientated ...
Found on
http://www.britannica.com/eb/a-z/d/28
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