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The time required for half of a reactant to be converted into product(s). The time required for half of a given sample to undergo radioactive decay.

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Atomic Radius

Radius of an atom.

Polar Bond

Covalent bond in which there is an unsymmetrical distribution of electron density.

Ionic Bonding

Chemical bonding resulting from the transfer of one or more electrons from one atom or a group of atoms to another.

Electron

A subatomic particle having a mass of 0.00054858 amu and a charge of 1-.

Weak Field Ligand

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

Canal Ray

Stream of positively charged particles (cations) that moves toward the negative electrode in cathode ray tubes, observed to pass through canals in the negative electrode.

Freezing Point Depression

The decrease in the freezing point of a solvent caused by the presence of a solute.ing Point

Molecular Orbital Theory

A theory of chemical bonding based upon the postulated existence of molecular orbitals.

D -Transition elements (metals)

B Group elements except IIB in the periodic table, sometimes called simply transition elements EX. Fe, Ni, Cu, Ti .
For further information see Metals.

Hydrate Isomers

Isomers of crystalline complexes that differ in whether water is present inside or outside the coordination sphere.