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Hydrated sulfates of the general formula M+M3+(SO4)2.12H2).

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Beta Particle

Electron emitted from the nucleus when a neuton decays to a proton and an electron.

Differential Thermometer

A thermometer used for accurate measurement of very small changes in temperature.

Artificial Transmutation

An artificially induced nuclear reaction caused by the bombardment of a nucleus with subatomic particiles or small nucei.

Semiconductor

A substance that does not conduct electricity at low temperatures but does so at higher temperatures.

Hydrophilic Colloids

Colloidal particles that repel water molecules.

Period

The elements in a horizontal row of the periodic table.

Oxidation Numbers

Arbitrary numbers that can be used as mechanical aids in writing formulas and balancing equations, for single- atom ions they correspond to the charge on the ion, more electronegative atoms are assigned negative oxidation numbers (also called Oxidation states).

Free Radical

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

End Point

The point at which an indicator changes colour and a titration is stopped.

Single Bond

Covalent bond resulting from the sharing of two electrons (one pair) between two atoms.