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Band containing nonradioactive nuclides in a plot of number of neutrons versus atomic number.

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Conjugated Double Bonds

Double bonds that are separated from each other by one single bond -C=C-C=C-.

Pauli Exclusion Principle

No two electrons in the same atom may have identical sets of four quantum numbers.

Hydrometer

A device used to measure the densities of liquids and solutions.

Hydrogen

Discovered : by Henry Cavendish in 1766.
Isolated in London, UK.
Origin : The name is derived from the Greek ‘hydro genes’, meaning water forming.
Description :A colourless, odourless gas that burns and can form an explosive mixture with air. It is currently manufactured from methane gas, but is also produced by the electrolysis of water and aqueous salts. The gas is used to make such key materials as ammonia, cyclohexane and methanol, which are intermediates in the production of fertilisers, plastics and pharmaceuticals. Some see hydrogen gas as the clean fuel of the future - generated from water and returning to water when it is oxidised. Hydrogen-powered fuel cells are increasingly being seen as pollution-free sources of energy.

Fluids

Substances that flow freely, gases and liquids.

Hydrolysis

The reaction of a substance with water or its ions.

Solvent

The dispersing medium of a solution.

Double Salt

Solid consisting of two co-crystallized salts.

 

Linkage Isomers

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

 

Nucleus

The very small, very dense, positively charged center of an atom containing protons and neutrons, as well as other subatomic particles.

Electrophile

Positively charged or electron-deficient.

Salt Bridge

A U-shaped tube containing electrolyte, which connects two half-cells of a voltaic cell.

Conduction Band

A partially filled band or a band of vacant energy levels just higher in energy than a filled band, a band within which, or into which, electrons must be promoted to allow electrical conduction to occur in a solid.

Coordination Isomers

Isomers involving exchanges of ligands between complex cation and complex anion of the same compound.

Delocalization

Of electrons, refers to bonding electrons that are distributed among more than two atoms that are bonded together, occurs in species that exhibit resonance.
The formation of a set of molecular orbitals that extend over more than two atoms, important in species that valence bond theory describes in terms of resonance.

Binary Acid

A binary compound in which H is bonded to one or more of the more electronegative nonmetals.

Extrapolate

To estimate the value of a result outside the range of a series of known values. Technique used in standard additions calibration procedure.

Breeder Reactor

A nuclear reactor that produces more fissionable nuclear fuel than it consumes.

Carbanion

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

Heat of Condensation

The amount of heat that must be removed from one gram of a vapor at it's condensation point to condense the vapour with no change in temperature.