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For which type of chemical bond are the bonding electrons not constrained to a localized region?

For which type of chemical bond are the bonding electrons not constrained to a localized region?

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Answer #1

In Metallic bonding the bonding electrons are not constrained to a localized region.

Metallic bonding occurs between atoms that have small number of electrons in their valence shell.

The outermost valence electrons of the atoms belong to the crystal as a whole , delocalised as a sea , in which they are free to move from one atom to the other. The positive charged ions are embedde in the sea as a closed packed 3D array.

In conjugated (pi)bonds also the bonding electrons are not constrained to a particular atom but they are free to move along all atoms which involve in the conjugation.

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