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Refers to the occurrence of an element in an uncombined or free state in nature.

 

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Active Metal

Metal with low ionization energy that loses electrons readily to form cations.

Acyl Group

Compound derived from a carbonic acid by replacing the --OH group with a halogen (X), usually --Cl, general formula is O R--C--X.

Chain Reaction

A reaction that, once initiated, sustains itself and expands. This is a reaction in which reactive species, such as radicals, are produced in more than one step. These reactive species, radicals, propagate the chain reaction.

 

Pauli Exclusion Principle

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

Nickel-cadmium cell (Nicad battery)

A dry cell in which the anode is Cd, the cathode is NiO2, and the electrolyte is basic.

Enzyme

A protein that acts as a catalyst in biological systems.

Hydrocarbons

Compounds that contain only carbon and hydrogen.

Ioniztion

The breaking up of a compound into separate ions.

Atomic Number


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

Nitrogenases

A class of enzymes found in bacteria within root nodules in some plants, which catalyze reactions by which N2 molecules from the air are converted to ammonia.