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The process in which a heavy nucleus splits into nuclei of intermediate masses and one or more protons are emitted.

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    Diamond is a crystalline modification of pure carbon formed in the deep interior of the Earth, in the upper mantle at depths of more than 80-100 kilometers, at exceptionally high pressure and temperature. It is the most precious stone, the hardest and most wear-resistant mineral, the most...

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Coordination Number

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

Ore

A natural deposit containing a mineral of an element to be extracted.

Critical Pressure

The pressure required to liquefy a gas (vapor) at its critical temperature.

Electron

A subatomic particle having a mass of 0.00054858 amu and a charge of 1-.

Particulate Matter

Fine divided solid particles suspended in polluted air.

Line Spectrum

An atomic emission or absorption spectrum.

Joule

A unit of energy in the SI system. One joule is 1 kg. m2/s2 which is also 0.2390 calorie.

Geiger counter

A gas filled tube which discharges electriaclly when ionizing radiation passes through it.

Anion

A negative ion, an atom or goup of atoms that has gained one or more electrons.

 

Homonuclear

Consisting of only one element.