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A positive ion, an atom or group of atoms that has lost one or more electrons.

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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.

 

Colligative Properties

Physical properties of solutions that depend upon the number but not the kind of solute particles present.

Coordination Number

In describing crystals, the number of nearest neighbours of an atom or ion. The number of donor atoms coordinated to a metal.

Lone Pair

Pair of electrons residing on one atom and not shared by other atoms, unshared pair.

Chemistry of the sky

Chemistry can teach us about the composition of celestial bodies and determine their age.

Nonpolar Bond

Covalent bond in which electron density is symmetrically distributed.

Chemical Change

A change in which one or more new substances are formed.

Conjugated Double Bonds

Double bonds that are separated from each other by one single bond -C=C-C=C-.

Fast Neutron

A neutron ejected at high kinetic energy in a nuclear reaction.

Free Radical

A highly reactive chemical species carrying no charge and having a single unpaired electron in an orbital.