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  Home >> Inorganic Chemistry Dictionary >> Nitroso sulphuric acid - Nuclear isomers

Nitrogenous base

A basic compound having nitrogen. The term is used especially of organic ring compounds such a s adenine, guanine, cytosine,  and thymine, which have been constituents of nucleic acids.

Nitronium ion

An electrophile; the cation NO2+, generated by the action of sulphuric acid on nitric acid during nitration reaction.

Nitroso sulphuric acid

Nitrosulphuric acid Nitrosulphonic acid. Alternate names for nitrosyl sulphuric acid or nitroso substituted sulphuric acid.

Nitryl ion (nitrouium ion)

The ion NO2+ found in mixtures of nitric acid and sulphuric acid and solutions of nitrogen oxides in nitric acid. Nitryl salts, such a NO2+ClO4-, can be isolated but are extremely reactive, Nitryl ions generated in situ are used for nitration in organic chemistry.

Nobelium

A chemical element, symbol NO, atomic number 102, atomic weight 254 when the element is produced in the laboratory; a synthetic element, in the actinium series.

Noble gas

A gas in group 0 of the periodic table of the elements; it is monoatomic and, with limited exceptions, chemically inert. Also known as inert gas.

Noble metals

Metals such as, silver, gold and platinum, that do not corrode or tarnish in air or water, and are not easily attacked by acids. From the chemical point of view, unreactive metals are low in the electromotive series.

Node

A region of very low electron density in an atom or molecule as predicted from wave equations.

Non-aqueous solution

A solution in which the solvent is not water but may be organic or inorganic, protonic or non-protonic. None-aqueous solvents may be self-ionized.

Non-aqueous solvent

Any solvent other than water. E.g. alcohol, liquid ammonia, liquid sulphurdioxide, BrF3etc.

Nonbenzenoid aromatics

Aromatic compounds having rings other than benzene rings, examples include the cyclopentadienyl anion, C5H5, and the tropyllium cation C7C7+.

Non-polar compound

A compound that has molecules with no permanent dipole moment. Examples of non-polar compounds are hydrogen, tetrachloromethane, and carbon dioxide.

Normal salt

A salt in which all of the acid hydrogen atoms have been replaced by a metal, or the hydroxide radicals of a base are placed by an acid radical; for example, Na2CO3.

Normal solution

An aqueous solution containing one equivalent of the active reagent in grams in 1 litre of the solution.

Nuclear isomers

Atoms of an element of the same mass but processing different rates of radioactive  decay.

Nuclear reactors

A device to produce the nuclear energy in a controlled way to be used for peaceful purposes. It works on the same principle as the atomic bomb but under controlled conditions. All the neutrons produced are not allowed to carry out the chain reaction.

Nucleon

A collective name for particles of mass number 1, i.e., protons and neutrons.

Occlusion

1. refers to the process in which small amounts of one substances are trapped in the crystals of another; for example, pockets of liquid occluded crystallisation from a solution.


2. refers to the absorption of a gas by a solid; for example, the occlusion of hydrogen by palladium.

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