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An element below and to the left of the stepwise division (metalloids) in the upper right corner of the periodic table, about 80% of the known elements are metals.

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Alkaline Battery

A dry cell in which the electrolyte contains KOH.

Kinetic Energy

Energy that matter processes by virtue of its motion.

Mass Action Expression

For a reversible reaction, aA + bB cC + dD the product of the concentrations of the products (species on the right), each raised to the power that corresponds to its coefficient in the balanced chemical equation, divided by the product of the concentrations of reactants (species on the left), each raised to the power that corresponds to its coefficient in the balanced chemical equation. At equilibrium the mass action expression is equal to K, at other times it is Q.[C]c[D]d [A]a[B]b = Q, or at equilibrium K.

Alkynes

Unsaturated hydrocarbons that contain one or more carbon-carbon triple bonds.

Pairing

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

Explosive limits

The range of concentrations over which a flammable vapour mixed with proper ratios of air will ignite or explode if a source of ignitions is provided.

Pauli Exclusion Principle

No two electrons in the same atom may have identical sets of four quantum numbers.

Mother Nuclide

Nuclide that undergoes nuclear decay.

Deposition

The direct solidification of a vapor by cooling, the reverse of sublimation.

Weak Field Ligand

A Ligand that exerts a weak crystal or ligand field and ge- nerally forms high spin complexes with metals.