Dictionary,Defintion,Meaning,What is Pseudohalogens, Radioactive decay,Quadrivalent, Cyanogen, Quantum number, Halogens

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Home >> Inorganic Chemistry Dictionary >> Pseudohalogens - Radioactive decay

	Protactinium A toxic radioactive element of the actinoids series of metals. It occurs in minute quantities in uranium ores. Symbol Pa; m.p. 1565 degree C. Protonic acid An acid that yields positive hydrogen ins (or, strictly, oxonium ions) in aqueous solution. The term is used to distinguish ‘traditional acids from Lewis acids or form Lowry¾Bronsted acids in non-aqueous solvents
Pseudohalogens A group of compounds, including cyanogen (CN)2 and thiocyanogen (SCN)2 that are having some resemblance to the halogens. Thus, they form hydrogen acids (HCN and HSCN) and ionic salts containing such ions as CN- and SCN- Quadrivalent Having a valence of four. Quantum mechanics A system of mechanics for atoms and molecules which used the quantum theory when describing forms of energy.
Quantum number Refers to an inter or half integer that specified the value of a quantized physical quantity (energy, angular momentum, etc.,). Quantum state Refers to the state of a quantized system as described by its quantum numbers. For instance, the state of a hydrogen atom is described by the four quantum numbers n, 1, m, m5. In the ground stat they have values1,0,1 and ½ respectively.
Quantum theory Max Planck put forward a theory in which he said that the absorption or emission of energy takes place in discrete units of quanta and not in continuous stream. Quartz SiO2, the low temperature form of silica, low temperature quartz crystallizes in enantiomorphous pairs. Quartz is used extensively for optical component, it is more transparent to u.v. radiation than is glass. Rock crystal is colourless and glassy, amethyst is violet (yellow on heating), brown nd yellow quartz are some-precious stones-cairngorms.
	Quenching A method which is used to alter the mechanical properties of metals. Hot metal is lowered quickly into a bath of oil, water, or brine and the rapid cooling results in a fine grain structure. This treatment tends to increase the hardness of a metal but often makes it brittle. Racemisation Refers to the conservation of an optical isomer into an equal mixture of isomers, which is not optically active.

Radioactive
Describing an element or nuclide that exhibits natural radioactivity

Radioactive dating
Any method of measuring the age of materials that depends on radioactivity.

Radioactive decay
Break up of an atom of radioactive element causes radiation (g-rays) or loss of particle.(a-particle or b-particle).

Radioactive element
An element all of whose isotopes spontaneously transform into one or more different nuclides, giving off various types of radiations; e.g., promethium, radium, thorium and uranium.

Radioactivity
The spontaneous disintegration of an unstable atomic nucleus which accompanies emission of alpha, beta or gamma radiations.

Radiochemistry
The chemistry of radioactive isotopes of elements. Radio-chemistry involves such topics like the preparation of radioactive compounds, the separation of isotopes by chemical reactions, the use of radioactive labels in studies of mechanisms, and experiments on the chemical reactions and compounds of transuranic elements.

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