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The arrangement of atoms (not lone pairs of electrons) about the central atom of a polyatomic ion.

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    Probably, every person wants to know, why over time the copper turns green and becomes bloomed. This is easy to explain: that film is called patina.

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Cation

A positive ion, an atom or group of atoms that has lost one or more electrons.

Kinetic-molecular Theory

A theory, that attempts to explain macroscopic observations on gases in microscopic observations on gases in microscopic observations on gases in microscopic or molecular terms.

Eutrophication

The undesirable overgrowth of vegetation caused by high concentrates of plant nutrients in bodies of water.

Cyclotron

A device for accelerating charged particles along a spiral path.

Particulate Matter

Fine divided solid particles suspended in polluted air.

xylidine

Any of six isomeric compounds that have the formula C8H11N, are derivatives of xylene, and resemble aniline: used in dye manufacture.

Molecular Equation

Equation for a chemical reaction in which all formulas are written as if all substances existed as molecules, only complete formulas are used.

Reactants

Substances consumed in a chemical reaction.

Quantum Numbers

Numbers that describe the energies of electrons in atoms, derived from quantum mechanical treatment.

K Capture

Absorption of a K shell (n=1) electron by a proton as it is converted to a neutron.