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The number of repeating corresponding points on a wave that pass a given observation point per unit time.

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Cyclotron

A device for accelerating charged particles along a spiral path.

Crystal Lattice

A pattern of arrangement of particles in a crystal.

Half-Cell

Compartment in which the oxidation or reduction half-reaction occurs in a voltaic cell.

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

Stoichiometry

Description of the quantitative relationships among elements and compounds as they undergo chemical changes.

Hydrogenation

The reaction in which hydrogen adds across a double or triple bond.

Mole Fraction

The number of moles of a component of a mixture divided by the total number of moles in the mixture.

 

Extrapolate

To estimate the value of a result outside the range of a series of known values. Technique used in standard additions calibration procedure.

Vapor Pressure

The particle pressure of a vapor at the surface of its parent liquid.

Insoluble Compound

A very slightly soluble compound.