Do covalent bonds only exist when the atoms have the same combining capacity?

Baloo55th

Covalent bonds can form when the electronegativity difference of the atoms is less than 1.67 (or 1.7 according to other people) otherwise one atom is dominant and an ionic bond is formed. http://members.aol.com/profchm/covalent.html Basically, in a covalent bond, the electrons are provided equally by the two atoms involved. In an ionic bond, one atom has more of the electrons (that's a bit simplified). In practice, it gets a bit more complicated than that, and http://www.chemguide.co.uk/atoms/bonding/covalent.html gives a very clear description of what is going on. Jul 15 06, 6:52 AM

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