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Decomposition by heating a substance in the presence of a catalyst and in the absence of air.

 

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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

Sigma Bonds

Bonds resulting from the head-on overlap of atomic orbitals, in which the region of electron sharing is along and (cylindrically) symmetrical to the imaginary line connecting the bonded atoms.

Strong Electrolyte

A substance that conducts electricity well in a dilute aqueous solution.

 

Polymerization

The combination of many small molecules to form large molecules.

Transition State Theory

Theory of reaction rates that states that reactants pass through high-energy transition states before forming products.

Alloying

Mixing of metal with other substances (usually other metals) to modify its properties.

Curie (Ci)

The basic unit used to describe the intensity of radioactivity in a sample of material. One curie equals 37 billion disintegrations per second or approximately the amount of radioactivty given off by 1 gram of radium.

Mixture

A sample of matter composed of two or more substances, each of which retains its identity and properties.

Linkage Isomers

Isomers in which a particular ligand bonds to a metal ion through different donor atoms.

 

Molecular Weight

The mass of one molecule of a nonionic substance in atomic mass units.