Types of Intramolecular Force
There are three main types of intramolecular force, distinguished by the types of constituent atoms and the behavior of electrons:
- Ionic, which generally form between a metal and nonmetal, such as sodium and chlorine in NaCl. Electrons in an ionic bond tend to mostly be found around one of the two constituent atoms; this is often described as one atom giving electrons to the other. In the case of NaCl, sodium would give an electron to chlorine.
- Covalent, which generally form between two nonmetals. Examples include nitrogen dioxide. Electrons in a covalent bond are essentially shared between the constituent atoms. There are several types of covalent bond: in polar covalent bonds, electrons are more likely to be found around one of the two atoms, whereas in nonpolar covalent bonds, electrons are evenly shared. Diatomic molecules are pure covalent. The polarity of a covalent bond is determined by the electronegativities of each atom, and a polar covalent bond usually creates a dipole moment.
- Metallic, which generally forms within a pure metal or metal alloy. Metallic electrons are generally delocalized; the result is a large number of free electrons around positive nuclei, sometimes called an electron sea.
They differ in the magnitude of their bond enthalpies, and thus affect the physical and chemical properties of compounds in different ways.
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