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One of the two mirror-image forms of an optically active molecule.

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Heavy Water

Water containing deuterium, a heavy isotope of hydrogen.

Sigma Bonds

Bonds resulting from the head-on overlap of atomic orbitals, in which the region of electron sharing is along and (cylindrically) symmetrical to the imaginary line connecting the bonded atoms.

Alkylbenzene

A compound containing an alkyl group bonded to a benzene ring.

D-Orbitals

Beginning in the third energy level, aset of five degenerate orbitals per energy level, higher in energy than s and p orbitals of the same energy level.

 

PseudobinaryIonic Compounds

Compounds that contain more than two elements but are named like binary compounds.

Electron Affinity

The amount of energy absorbed in the process in which an electron is added to a neutral isolated gaseous atom to form a gaseous ion with a 1- charge, has a negative value if energy is released.

Substitution Reaction

A reaction in which an atom or a group of atoms is replaced by another atom or group of atoms.

S Orbital

A spherically symmetrical atomic orbital, one per energy level.

Oxidation-reduction Reactions

Reactions in which oxidation and reduction occur, also called redox reactions.

Excited State

Any state other than the ground state of an atom or molecule.