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=== Molecular Compound ===
=== Molecular Compound ===
A ''molecular compound'' is a compound which is composed of atoms joined by [[covalent bond]]s. In contrast to the formula unit of ionic crystals, the basic unit of a molecular compound is the ''molecule''. A molecule is the smallest particle of a compound that retains the unique defining properties of that compound.
A ''molecular compound'' is composed of atoms joined by [[covalent bond]]s. In contrast to the formula unit of ionic crystals, the basic unit of a molecular compound is the ''molecule''. A molecule is the smallest particle of a compound that retains the unique defining properties of that compound.
Molecules may be either ''polar'' or ''nonpolar''. Polar molecules have an unequal distribution of electric charge among their atoms, giving them distinct positive and negative regions. The charge in any region of a polar molecule is almost never equal to the full charge on, say, a single [[proton]] or [[electron]]. If it were, then the particle would be an ion. Nonpolar molecules distribute their electrons evenly and thus have no partial positive or partial negative charge on any aspect of them.
Molecules may be either ''polar'' or ''nonpolar''. Polar molecules have an unequal distribution of electric charge among their atoms, giving them distinct positive and negative regions. The charge in any region of a polar molecule is almost never equal to the full charge on, say, a single [[proton]] or [[electron]]. If it were, then the particle would be an ion. Nonpolar molecules distribute their electrons evenly and thus have no partial positive or partial negative charge on any aspect of them.