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A theory of chemical bonding based upon the postulated existence of molecular orbitals.

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  • Varieties of garnet minerals

    The most famous type of garnet stone is pyrope (flaming). This is the "oldest of garnets", with a dense red color, similar to the grain of an edible garnet. Pyrope has a variety called rhodolite - a stone of dense pink or pink-purple color, which sometimes has the alexandrite effect and is used in...

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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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Central Atom

An atom in a molecule or polyatomic ion that is bonded to more than one other atom.

xenon trioxide

A colorless, nonvolatile solid, XeO3, explosive when dry: in solution it is called xenic acid.

Dubnium

Discovered : at both Berkeley, California, USA, and Dubna, near Moscow, Russia in 1970. Description:A highly radioactive metal which does not occur naturally, and of which only a few atoms have ever been made. It is of research interest only. Origin:The element is named after the Russian town of Dubna.

Kinetic Energy

Energy that matter processes by virtue of its motion.

Percent Purity

The percent of a specified compound or element in an impure sample.

Salicylate

A salt or ester of salicylic acid.

Enzyme

A protein that acts as a catalyst in biological systems.

Critical Point

The combination of critical temperature and critical pressure of a substance.

Dipole-dipole Interactions

Attractive interactions between polar molecules, that is, between molecules with permanent dipoles.

Molecule

The smallest particle of an element or compound capable of a stable, independent existence.