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

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Condensed States

The solid and liquid states.

Combination Reaction

Reaction in which two substances (elements or compounds) combine to form one compound.

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

Reactants

Substances consumed in a chemical reaction.

Molecule

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

Fast Neutron

A neutron ejected at high kinetic energy in a nuclear reaction.

Electronic Geometry

The geometric arrangement of orbitals containing the shared and unshared electron pairs surrounding the central atom of a molecule or polyatomic ion.

Saccharide

An organic compound containing a sugar or sugars.

Ground State

The lowest energy state or most stable state of an atom, molecule or ion.

Salicylaldehyde

An oily, slightly water-soluble liquid, C7H6O2, having an almondlike odor: used chiefly in perfumery and in the synthesis of coumarin.