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Helium ion with 2+ charge, an assembly of two protons and two neutrons.

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Pauli Exclusion Principle

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

Alkenes (Olefins)

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

Periodic Law

The properties of the elements are periodic functions of their atomic numbers.

Saponification

Hydrolysis of esters in the presence of strong soluable bases.

Binary Acid

A binary compound in which H is bonded to one or more of the more electronegative nonmetals.

Nonbonding Orbital

A molecular orbital derived only from an atomic orbital of one atom, lends neither stability nor instability to a molecule or ion when populated with electrons.

Flammable

A liquid as defined by NFPD and DOT as having a flash point below 37.8°C (100°F).

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.

Photochemical Oxidants

Photochemically produced oxidizing agents capable of causing damage to plants and animals.

Use of diamonds

Diamond is a crystalline modification of pure carbon formed in the deep interior of the Earth, in the upper mantle at depths of more than 80-100 kilometers, at exceptionally high pressure and temperature. It is the most precious stone, the hardest and most wear-resistant mineral, the most brilliant and timeless gem.