Resonance

MO

In ________ theory, when the starting atomic orbitals are not equal in energy, the resulting molecular orbitals most resemble (have a greater contribution from) the atomic orbital that is closest in energy.

Conjugation

________: lack of atoms between pi bonds or between pi bonds and lone- pair electrons.

delocalization

We consider ________ only for molecules containing p bonds adjacent to pi bonds and /or pi bonds adjacent to lone pairs.

pi bond

In general, whenever atoms are involved in resonance that has one or more contributing structures involving a(n) ________ to that atom, the atoms must be sp2 hybridized (or on rare occasions, sp hybridized, but never sp3 hybridized)

Resonance

________ hybrid: a molecule, an ion, or a radical described as a composite of a number of contributing structures.

Theory of resonance

________: many molecules and ions are best described by writing two or more Lewis structures and considering the real molecule or ion to be a composite of these structures.

Delocalization

________: the spreading of charge and /or an electron density over a larger volume of space.

Theory of resonance

many molecules and ions are best described by writing two or more Lewis structures and considering the real molecule or ion to be a composite of these structures

Contributing structures

individual Lewis structures; resonance structures

Resonance hybrid

a molecule, an ion, or a radical described as a composite of a number of contributing structures

Delocalization

the spreading of charge and/or an electron density over a larger volume of space

Conjugation

lack of atoms between pi bonds or between pi bonds and lone-pair electrons