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An algebraic increase in the oxidation number, may correspond to a loss of electrons.

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Electroplating

Plating a metal onto a (cathodic) surface by electrolysis.

Donor Atom

A ligand atom whose electrons are shared with a Lewis acid.

Bond Energy

The amount of energy necessary to break one mole of bonds of a given kind (in gas phase).The amount of energy necessary to break one mole of bonds in a substance, dissociating the sustance in the gaseous state into atoms of its elements in the gaseous state.

Covalent Bond

Chemical bond formed by the sharing of one or more electron pairs between two atoms.

Atmosphere

A unit of pressure, the pressure that will support a column of mercury 760 mm high at 0 °C.

Homogeneous Mixture

A mixture which has uniform composition and properties throughout.

Oxidizing Agent

The substance that oxidizes another substance and is reduced.

Helium

Discovered : by Sir William Ramsay in London, and independently by P.T. Cleve and N.A. Langlet in Uppsala, Sweden in 1895.
Origin : The name is derived from the Greek ‘helios’,sun.
Description :A colourless, odourless gas that is totally unreactive. It is extracted from natural gas wells, some of which contain gas that is 7% helium. It is used in deep sea diving for balloons and, as liquid helium, for low temperature research. The Earth’s atmosphere contains 5 parts per million by volume, totalling 400 million tons, but it is not worth extracting it from this source at present.
Atomic No:2 MAss No:4

Critical Mass

The minimum mass of a particular fissionable nuclide in a given volume required to sustain a nuclear chain reaction.

Periodic Law

The properties of the elements are periodic functions of their atomic numbers.