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An atomic emission or absorption spectrum.

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Double Salt

Solid consisting of two co-crystallized salts.

 

Shielding Effect

Electrons in filled sets of s , p orbitals between the nucleus and outer shell electrons shield the outer shell electrons somewhat from the effect of protons in the nucleus, also called screening effect.

Exothermicity

The release of heat by a system as a process occurs.

Cathodic Protection

Protection of a metal (making ir a cathode) against corrosion by attaching it to a sacrifical anode of a more easily oxidized metal.

Curie (Ci)

The basic unit used to describe the intensity of radioactivity in a sample of material. One curie equals 37 billion disintegrations per second or approximately the amount of radioactivty given off by 1 gram of radium.

Covalent Bond

Chemical bond formed by the sharing of one or more electron pairs between two atoms.

Particulate Matter

Fine divided solid particles suspended in polluted air.

Band

A series of very closely spaced, nearly continuous molecular orbitals that belong to the crystal as a whole.

Entropy

A thermodynamic state or property that measures the degree of disorder or randomness of a system.

Native State

Refers to the occurrence of an element in an uncombined or free state in nature.