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Theory of reaction rates that states that reactants pass through high-energy transition states before forming products.

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Electronegativity

A measure of the relative tendency of an atom to attract electrons to itself when chemically combined with another atom.

Acidic Salt

A salt containing an ionizable hydrogen atom. Acidic salt does not necessarily produce acidic solutions.

Gem-dimethyl group

Two methyl groups of the same carbon atom.

Collision Theory

Theory of reaction rates that states that effective collisions between reactant molecules must occur in order for the reaction to occur.

Lone Pair

Pair of electrons residing on one atom and not shared by other atoms, unshared pair.

Ionization Energy

The minimum amount of energy required to remove the most loosely held electron of an isolated gaseous atom or ion.

Pauli Exclusion Principle

No two electrons in the same atom may have identical sets of four quantum numbers.

Geometrical Isomers

Compounds with different arrangements of groups on either side of a bond with restricted rotation, such as a double bond or a single bond in a ring, for example cis-trans isomers of certain alkenes. Stereoisomers that are not mirror images of each other, also known as position isomers.

Element

A substance that cannot be decomposed into simpler substances by chemical means.

Secondary Voltaic Cells

Voltaic cells that can be recharged, original reactanats can be regenerated be reversing the direction of the current flow.