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Very weak and very short-range attractive forces between short-lived temporary (induced) dipoles, also called dispersion Forces.

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Binary Compound

A compound consisting of two elements, may be ionic or covalent.

Hund's Rule

All orbitals of a given sublevel must be occupied by single electrons before pairing begins.

Dipole

Refers to the separation of charge between two covalently bonded atoms.

Shielding Effect

Electrons in filled sets of s , p orbitals between the nucleus and outer shell electrons shield the outer shell electrons somewhat from the effect of protons in the nucleus, also called screening effect.

Formal Charge

A method of counting electrons in a covalently bonded molecule or ion, counts bonding electrons as though they were equally shared between the two atoms.

Dissociation Constant

Equilibrium constant that applies to the dissociation of a comples ion into a simple ion and coordinating species (ligands).

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.

 

Tyndall Effect

The scattering of light by colloidal particles.

Contact Process

Industrial process by which sulfur trioxide and sulfuric acid are produced from sulfur dioxide.

Atmosphere

A unit of pressure, the pressure that will support a column of mercury 760 mm high at 0 °C.