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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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Mechanism

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

Distillate

The material in a distillation apparatus that is collected in the receiver.

 

Diagonal Similarities

Refers to chemical similarities in the Periodic Table of elements of Period 2 to elements of Period 3 one group to the right, especially evident toward the left of the periodic table.

Entropy

A thermodynamic state or property that measures the degree of disorder or randomness of a system.

Ternary Compound

A compound consisting of three elements, may be ionic or covalent.

Fractional Distillation

The process in which a fractioning column is used in distillation apparatus to separate components of a liquid mixture that have different boiling points.

Dispersing Medium

The solvent-like phase in a colloid.

Calorie

The amount of heat required to raise the temperature of one gram of water from 14.5°C to 15.5°C. 1 calorie = 4.184 joules.

Ampere

Unit of electrical current, one ampere equals one coulomb per second.

 

Nonelectrolyte

A substance whose aqueous solutions do not conduct electricity.