Discovered: known in India and China before 1500 and to the Greeks and Romans before 20 BC as the copper-zinc alloy brass
Origin: The name is derived from the German ‘Zink’.
Atomic no: 30
Mass No: 65
Description: A grey metal with a blue tinge. World production exceeds 7 million tons a year, and it is used to galvanise iron to prevent it rusting. It is also employed in alloys and batteries, and as zinc oxide to stabilise rubber and plastics. Zinc is essential for all living things, and is important for growth and development. The average human body contains about 2.5 grams and takes in about 15 milligrams per day. Some foods have above average levels of zinc, including herring, beef, lamb, sunflower seeds and cheese.
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xylic acid
Any of six colorless, crystalline, isomeric acids having the formula C9H10O2, derived from xylene.
Cell Potential
Potential difference, Ecell, between oxidation and reduction half-cells under nonstandard conditions.
Coordination Sphere
The metal ion and its coordinating ligands but not any uncoordinated counter-ions.
Lead Storage Battery
Secondary voltaic cell used in most automobiles.
Catalyst
A substance that speeds up a chemical reaction without being consumed itself in the reaction.
A substance that alters (usually increases) the rate at which a reaction occurs.
Graham's Law
The rates of effusion of gases are inversely proportional to the square roots of their molecular weights or densities.
Forbidden Zone
A relatively large energy separation between an insulator's highest filled electron energy band and the next higher energy vacant band. Beginning in the fourth energy level, a set of seven degenerate orbitals per energy level, higher in energy than s, p, and d orbitals of the same energy level.
Cation
A positive ion, an atom or group of atoms that has lost one or more electrons.
Electronegativity
A measure of the relative tendency of an atom to attract electrons to itself when chemically combined with another atom.
Osmotic Pressure
The hydrostatic pressure produced on the surface of a semipermable membrane by osmosis.
