electrovalent bond


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electrovalent bond:

see chemical bondchemical bond,
mechanism whereby atoms combine to form molecules. There is a chemical bond between two atoms or groups of atoms when the forces acting between them are strong enough to lead to the formation of an aggregate with sufficient stability to be regarded as an
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.

Electrovalent Bond

 

a type of chemical bond, based on electrostatic interaction between ions of opposite charge. Relatively pure bonds of this type form in alkali metal halides, such as KF, since each atom of the alkali metal has a weakly bound electron (bonding energy, about 3–5 electron volts), whereas the halogen atoms have the greatest affinity for electrons. However, even in crystals (and particularly the molecules) of these compounds, complete transfer of the electron from the metal atom to the halogen atom does not take place in most cases. The previously widely held views concerning the formation of divalent, trivalent, or tetravalent ions, such as Ca2+, O2-, B3+, and Si4+, have not been confirmed in most cases, since here the chemical bond is formed in a more complex way. The concept of the effective ionic charge is used in estimating the degree to which a bond is electrovalent.

V. A. KIREEV

electrovalent bond

[i¦lek·trō¦vā·lənt ′bänd]
(physical chemistry)
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