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A physical state of matter which exists at extremely high temperatures in which all molecules are dissociated and most atoms are ionized.

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Percent Composition

The mass percent of each element in a compound.

Insoluble Compound

A very slightly soluble compound.

Melting Point

The temperature at which liquid and solid coexist in equilibrium, also the freezing point.

Condensation

Liquefaction of vapor.

Solution

Homogeneous mixture of two or more substances.

Background Radiation

Ratiation extraneous to an experiment. Usually the low-level natural radiation form cosmic rays and trace radioactive substances present in our environment.

Collision Theory

Theory of reaction rates that states that effective collisions between reactant molecules must occur in order for the reaction to occur.

Faraday's Law of Electrolysis

One equivalent weight of a substance is produced at each electrode during the passage of 96,487 coulombs of charge through an electrolytic cell.

Cyclotron

A device for accelerating charged particles along a spiral path.

Amphoterism

The ability to react with both acids and bases.Ability of substance to act as either an acid or a base.

Calorimeter

A device used to measure the heat transfer between system and surroundings.

Faraday

One faraday of electricity corresponds to the charge on 6.022 x 1023 electrons, or 96,487.301 coulombs.

Buret

A piece of volumetric glassware, usually graduated in 0.1-mL intervals, that is used to deliver solutions to be used in titrations in a quantitative (dropwise) manner.

Hund's Rule

All orbitals of a given sublevel must be occupied by single electrons before pairing begins.

Vapor Pressure

The particle pressure of a vapor at the surface of its parent liquid.

Ligand

A Lewis base in a coordination compound.

Heavy Water

Water containing deuterium, a heavy isotope of hydrogen.

xenon hexafluoride

A colorless, crystalline compound, XeF6, that melts at 50°C to a yellow liquid, and boils at 75°C.

Crystal Lattice

A pattern of arrangement of particles in a crystal.

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