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Integral number of protons in the nucleus, defines the identity of element.
 

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xenon

A heavy, colorless, chemically inactive, monatomic gaseous element used for filling radio, television, and luminescent tubes. Symbol: Xe, at. wt.: 131.30, at. no.: 54.

Sigma Bonds

Bonds resulting from the head-on overlap of atomic orbitals, in which the region of electron sharing is along and (cylindrically) symmetrical to the imaginary line connecting the bonded atoms.

Foam

Colloidal suspension of a gas in a liquid.

Dispersed Phase

The solute-like species in a colloid.

Specific Gravity

The ratio of the density of a substance to the density of water.

Halogens

Group VIIA elements: F, Cl, Br, I

Mechanism

The sequence of steps by which reactants are converted into products.

Third Law of Thermodynamics

The entropy of a hypothetical pure, perfect, crystalline sustance at absolute zero temperature is zero.

Faraday's Law of Electrolysis

One equivalent weight of a substance is produced at each electrode during the passage of 96,487 coulombs of charge through an electrolytic cell.

Unsaturated Hydrocarbons

Hydrocarbons that contain double or triple carbon-carbon bonds.