| A | B |
|---|
| covalent bond | a bond formed when atoms share one or more pairs of electrons |
| molecular orbital | the region of high probability that is occupied by an individual electron as it travels with a wavelike motion in the three dimensional space around one of two or more associated nuclei |
| bond length | the distance between two bonded atoms at their minimum potential energy; the average distance between the nuclei of two bonded atoms |
| bond energy | the energy required to break the bonds in 1 mol of a chemical compound |
| nonpolar covalent bond | a covalent bond in which the bonding electrons are equally attracted to both bonded atoms |
| polar covalent bond | a covalent bond in which a shared pair of electrons is held more closely by one of the atoms |
| dipole | a molecule or part of a molecule that contains both positively and negatively charged regions |
| valence electrons | an electron that is found in the outermost shell of an atom and that determines the atom's chemical properties |
| Lewis structure | a structural formula in which electrons arfe represented by dots; dot pairs or dashes between two atomic symbols repreent pairs in covalent bonds |
| unshared pair | a nonbonding pair of electrons in the valence shell of an atom; long pair |
| single bond | a covalent bond in which two atoms share one pair of electrons |
| double bond | a covalent bond in which two atoms share two pairs of electrons |
| triple bond | a covalent bond in which two atoms share three pairs of electrons |
| resonance structure | in chemistry, an one of two or more possible configurations of the same compound that have identical geometry but different arrangements of electrons |
| valence shell electron pair repulsion (VSEPR) theory | a theory that predicts some molecular shapes based on the iddea that pairs of valence electrons surrounding an atom repel each other |
