bond coordination (or dative)
is a special kind of covalent bond that in the past dative because the two electrons involved in the bond come from one of the two atoms that employer (or agent nucleophile), while the other is called acceptor (electrophile or agent) and have an empty orbital in which to "accommodate" this pair.
bonds and delocalized metallic bond
Some covalent bonds, those relocated, they can tie together three or more atoms simultaneously.
The most extreme form of relocation of the covalent bond occurs in the metallic bond. According to this model a metal can be represented as a lattice of positive ions held together by an electron cloud shared across the whole network, since these electrons are not linked to any particular atom, are be highly mobile, this mobility is responsible for high electrical conductivity of metals.
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