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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.

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Radioactive Tracer

A small amount of radioisotope replacing a nonradioactive isotope of the element in a compound whose path (for example, in the body) or whose decomposition products are to be monitored by detection of radioctivity, also called a radioactive label.

Covalent Compounds

Compounds containing predominantly covalent bonds.

Unsaturated Hydrocarbons

Hydrocarbons that contain double or triple carbon-carbon bonds.

Do you know: some mosquitoes bite people because of their clothes

If you have ever been bitten by a mosquito, someone nearby surely gave you an explanation of why the nasty insect decided to spoil your day. Maybe they told you that you smelt good, or you had a certain type of blood or that in that shirt you looked like a potential victim.

Shielding Effect

Electrons in filled sets of s , p orbitals between the nucleus and outer shell electrons shield the outer shell electrons somewhat from the effect of protons in the nucleus, also called screening effect.

Band

A series of very closely spaced, nearly continuous molecular orbitals that belong to the crystal as a whole.

Oxidizing Agent

The substance that oxidizes another substance and is reduced.

Vapor Pressure

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

Enantiomer

One of the two mirror-image forms of an optically active molecule.

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