- when both electrons in a pair are coming from a single atom
Covalent bonding is when two atoms 'share' a pair of electrons. Dative covalent bonding is when both electrons in that pair come from the same atom, and 'donate' them to the other atom.
- the atom 'donating' the electrons has to have a lone pair of electrons
- a lone pair of electrons is a pair of electrons that are not involved in any other type of bonding e.g. covalent
- the atom accepting the electrons is an electron deficient atom (it does not have enough electrons to fill its outer shell)
Dative covalent bonding is represented with an arrow rather than by lines.
For example, the bond between a carbon and oxygen atom is carbon oxide can be displayed as C --- O. But dative covalent bonding looks different.
For H3O+, two hydrogen atoms would covalently bond with the oxygen, and these two bonds are show by normal lines (--) but the third hydrogen bonds with oxygen with a dative covalent bond. Therefore that part of the diagram would look like this: O --> H rather than O -- H.
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