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Bonds resulting from the head-on overlap of atomic orbitals, in which the region of electron sharing is along and (cylindrically) symmetrical to the imaginary line connecting the bonded atoms.

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Half-Reaction

Either the oxidation part or the reduction part of a redox reaction.

Positron

A Nuclear particle with the mass of an electron but opposite charge.

xylose

A colorless, crystalline pentose sugar, C5H10O5, derived from xylan, straw, corncobs, etc., by treating with heated dilute sulfuric acid, and dehydrating to furfural if stronger acid is used.

Spectrum

Display of component wavelengths (colours) of electromagnetic radiation.

Boron Hydrides

Binary compounds of boron and hydrogen.

Magnetic Quantum Number (mc)

Quantum mechanical solution to a wave equation that designates the particular orbital within a given set (s, p, d, f ) in which a electron resides.

Aufbau ('building up') Principle

Describes the order in which electrons fill orbitals in atoms.

Dermal toxicity

Adverse health effects resulting from skin exposure ot a substance.

Oxidation

An algebraic increase in the oxidation number, may correspond to a loss of electrons.

Supersaturated Solution

A solution that contains a higher than saturation concentration of solute, slight disturbance or seeding causes crystallization of excess solute.