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Elements 89 to 103 (between lawrencium and actinium) on the periodic table. Only the first four have been found in nature in appreciable amounts. The remainder have been produced synthetically.

All actinides are radioactive, highly electropositive, tarnish readily in air, react with boiling water or dilute acid to release hydrogen gas and combine directly with most nonmetals.

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Tetrahedral

A term used to describe molecules and polyatomic ions that have one atom in center and four atoms at the corners of a tetrahedron.

Coordination Isomers

Isomers involving exchanges of ligands between complex cation and complex anion of the same compound.

Fluids

Substances that flow freely, gases and liquids.

Molecular Weight

The mass of one molecule of a nonionic substance in atomic mass units.

Cathode

Electrode at which reduction occurs in a cathode ray tube, the negative electrode.

Linear Accelerator

A device used for accelerating charged particles along a straight line path.

Crystal Lattice Energy

Amount of energy that holds a crystal together, the energy change when a mole of solid is formed from its constituent molecules or ions (for ionic compounds) in their gaseous state.

Phenol

Hydrocarbon derivative containing an [OH] group bound to an aromatic raing.

 

Polyene

A compound that contains more than one double bond per molecule.

Canal Ray

Stream of positively charged particles (cations) that moves toward the negative electrode in cathode ray tubes, observed to pass through canals in the negative electrode.