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At constant temperature and pressure, the volumes of reacting gases (and any gaseous products) can be expressed as ratios of small whole numbers.

 

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Mass Number

The sum of the numbers of protons and neutrons in an atom, an integer.

Aufbau ('building up') Principle

Describes the order in which electrons fill orbitals in atoms.

Percent Purity

The percent of a specified compound or element in an impure sample.

D -Transition elements (metals)

B Group elements except IIB in the periodic table, sometimes called simply transition elements EX. Fe, Ni, Cu, Ti .
For further information see Metals.

Substitution Reaction

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

Organic Chemistry

The chemistry of substances that contain carbon-hydrogen bonds.

Alkyl Group

A group of atoms derived from an alkane by the removal of one hydrogen atom.

Lead Storage Battery

Secondary voltaic cell used in most automobiles.

Bronsted-Lowry Acid

A proton donor.

Magnetic Quantum Number (mc)

Quantum mechanical solution to a wave equation that designates the particular orbital within a given set (s, p, d, f ) in which a electron resides.