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Method of dating ancient objects by determining the ratio of amounts of mother and daughter nuclides present in an object and relating the ratio to the object?s age via half-life calculations.

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Antibonding Orbital

A molecular orbital higher in energy than any of the atomic orbitals from which it is derived, lends instability to a molecule or ion when populated with electrons, denoted with a star (*) superscript or symbol.

Chemistry is a familiar school subject

Everyone liked to observe the reaction of reagents. But few know interesting facts about chemistry, which we will discuss in this article.

Octane Number

A number that indicates how smoothly a gasoline burns.

Group

A vertical column in the periodic table, also called a family.

Cis-

The prefix used to indicate that groups are located on the same side of a bon about which rotation is restricted.

Structural Isomers

Compounds that contain the same number of the same kinds of atoms in different geometric arrangements.

xylose

A colorless, crystalline pentose sugar, C5H10O5, derived from xylan, straw, corncobs, etc., by treating with heated dilute sulfuric acid, and dehydrating to furfural if stronger acid is used.

Carbanion

An organic ion carrying a negative charge on a carbon atom.

Anode

In a cathode ray tube, the positive electrode. Electrode at which oxidation occurs.

Absorption Spectrum

Spectrum associated with absorption of electromagnetic radiation by atoms (or other species) resulting from transitions from lower to higher energy states. An absorption spectrum is the inverse of an emission spectrum.