Halogen: An element of group VIIA (a. k. a. Group 18). The name means 'salt former'; halogens react with metals to form binary ionic compounds. Fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At) are known at this time.

 

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Halogen: An element of group VIIA (a. k. a. Group 18). The name means 'salt former'; halogens react with metals to form binary ionic compounds. Fluorine (F), chlorine (Cl), bromine (Br), iodine (I), . . . View Full Definition

Halogens: Collective term for the elements chlorine, bromine and iodine, which are combined with silver to produce the light sensitive crystals used as the basis for photographic emulsions.

Rehalogenization: Process by which black metallic silver is converted back to silver halides. It is used in bleaching for toners and intensification.

Tungsten Halogen Lamp: Improved version of the normal tungsten lamp. It is much smaller and more consistent in color temperature as the glass envelope used is non-blackening.

Alkyl Halide: An alkyl group attached to a halogen atom.

Titanium (Ti): Atomic number: 22, Atomic mass: 47.90 g.mol -1, Electronegativity: 1.5, Density: 4.51 g.cm-3 at 20°C, Melting point: 1660 °C, Boiling point: 3287 °C, Vanderwaals radius: 0.147 nm, Ionic radi . . . View Full Definition

Sodium (Na): Atomic number: 11, Atomic mass: 22.98977 g.mol -1, Electronegativity: 0.9, Density: 0.97 g.cm -3 at 20 °C, Melting point: 97.5 °C, Boiling point: 883 °C, Vanderwaals radius: 0.196 nm, Ionic . . . View Full Definition

Acid Halide: Acid chloride; acyl halide; acyl chloride. Compounds containing a carbonyl group bound to a halogen atom.

Potassium Bromide: Chemical used as a restrainer in most developing solutions and as a rehalogenizing agent in bleaches.

Bleach: A dilute solution of sodium hypochlorite or calcium hypochlorite which kills bacteria and destroys colored organic materials by oxidizing them.