Si ha un legame chimico when an electrostatic force holds together more atoms in a molecule or a crystal (strong bonds or intramolecular) or more molecules in a substance in condensed (weak bonds, or intermolecular). The atoms form chemical bonds to achieve a more stable electronic configuration, general electronic configuration of the nearest noble gas, then the octet. The noble gases, which have already reached the octet, do not form chemical bonds.
ties can be strong (pure covalent, polar covalent, ionic, relocation and coordination) or weak (secondary chemical bonds).
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