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Elements with properties intermediate between metals and nonmetals: B, Al, Si, Ge, As, Sb, Te, Po, and At.

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Atmosphere

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

Hydrometer

A device used to measure the densities of liquids and solutions.

PseudobinaryIonic Compounds

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

Explosive

A chemical or compound that causes a sudden, almost instantaneous release or pressure, gas, heat and light when subjected to sudden shock, pressure, high temperature or applied potential.

Suspension

A heterogeneous mixture in which solute-like particles settle out of solvent-like phase some time after their introduction.

Bonding Orbital

A molecular orbit lower in energy than any of the atomic orbitals from which it is derived, lends stability to a molecule or ion when populated with electron.

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.

Domain

A cluster of atoms in a ferromagnetic substance, all of which align in the same direction in the presence of an external magnetic field.

Oxidation-reduction Reactions

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

Substance

Any kind of matter all specimens of which have the same chemical composition and physical properties.