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A packet of light or electromagnetic radiation, also called quantum of light.

 

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Heterogeneous Mixture

A mixture that does not have uniform composition and properties throughout.

Beta Particle

Electron emitted from the nucleus when a neuton decays to a proton and an electron.

Formula Weight

The mass of one formula unit of a substance in atomic mass units.

 

Electron

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

Stoichiometry

Description of the quantitative relationships among elements and compounds as they undergo chemical changes.

Valence Electrons

Outermost electrons of atoms, usually those involved in bonding.

Bonding Orbital

A molecular orbit lower in energy than any of the atomic orbitals from which it is derived, lends stability to a molecule or ion when populated with electron.

Gamma Ray

High energy electromagnetic radiation. A highly penetrating type of nuclear radiation similar to x-ray radiation, except that it comes from within the nucleus of an atom and has a higher energy. Energywise, very similar to cosmic ray except that cosmic rays originate from outer space.

Levorotatory

Refers to an optically active substance that rotates the plane of plane polarized light counterclockwise, also called levo.

Hydride

A binary compound of hydrogen.