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Valence bond designation for a complex in which the metal ion utilizes d orbitals in the outermost (occupied) shell in hybridization.

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Molarity

Number of moles of solute per litre of solution.

Doublet

Two peaks or bands of about equal intensity appearing close together on a spectrogram.

Adsorption

Adhesion of a species onto the surfaces of particles.

Salicylaldehyde

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

Heteronuclear

Consisting of different elements.

K Capture

Absorption of a K shell (n=1) electron by a proton as it is converted to a neutron.

Colloid

A heterogeneous mixture in which solute-like particles do not settle out.

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

Dumas Method

A method used to determine the molecular weights of volatile liquids.

van der Waals' Equation

An equation of state that extends the ideal gas law to real gases by inclusion of two empirically determined parameters, which are different for different gases.