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The relative amounts of reactants and products involved in a reaction, maybe the ratio of moles. millimoles, or masses.

 

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Metal

An element below and to the left of the stepwise division (metalloids) in the upper right corner of the periodic table, about 80% of the known elements are metals.

Electronic Geometry

The geometric arrangement of orbitals containing the shared and unshared electron pairs surrounding the central atom of a molecule or polyatomic ion.

Titration

A Procedure in which one solution is added to another solution until the chemical reaction between the two solutes is complete, the concentration of one solution is known and that of the other is unknown.

 

Compound

A substance of two or more elements in fixed proportions. Compounds can be decomposed into their constituent elements.

Homologous Series

A series of compounds in which each member differs from the next by a specific number and kind of atoms.

Vapor Pressure

The particle pressure of a vapor at the surface of its parent liquid.

Heterogeneous Catalyst

A catalyst that exists in a different phase (solid, liquid or gas) from the reactants, a contact catalyst.

Carbanion

An organic ion carrying a negative charge on a carbon atom.

Isotopes

Two or more forms of atoms of the same element with different masses, atoms containing the same number of protons but different numbers of neutrons.

Pauli Exclusion Principle

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