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A favourable interaction of two electrons with opposite m , values in the same orbital.

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Surface Tension

It is the force in dynes acting along the surface of the liquid 1cm in length and perpendicular to it.

Flash Point

The temperature at which a liquid will yield enough flamable vapour to ignite. There are various recognized industrial testing methods, therefore the method used must be stated.

Electronegativity

A measure of the relative tendency of an atom to attract electrons to itself when chemically combined with another atom.

Hess' Law of Heat Summation

The enthalpy change for a reaction is the same whether it occurs in one step or a series of steps.

Atomic Weight

Weighted average of the masses of the constituent isotopes of an element, The relative masses of atoms of different elements.

Leclanche Cell

A common type of dry cell.

Radioactivity

The spontaneous disintegration of atomic nuclei.

Indicators

For acid-base titrations, organic compounds that exhibit different colors in solutions of different acidities, used to determine the point at which reaction between two solutes is complete.

Amine Complexes

Complex species that contain ammonia molecules bonded to metal ions.

Ampere

Unit of electrical current, one ampere equals one coulomb per second.