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Binary compounds of boron and hydrogen.

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Metal

An element below and to the left of the stepwise division (metalloids) in the upper right corner of the periodic table, about 80% of the known elements are metals.

Molar Solubility

Number of moles of a solute that dissolve to produce a litre of saturated solution.

Ampere

Unit of electrical current, one ampere equals one coulomb per second.

 

Alloying

Mixing of metal with other substances (usually other metals) to modify its properties.

Nitrogen Cycle

The complex series of reactions by which nitrogen is slowly but continually recycled in the atmosphere, lithosphere and hydrosphere.

 

Vapor

A gas formed by boiling or evaporating a liquid.

Dumas Method

A method used to determine the molecular weights of volatile liquids.

Zinc

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.

20 interesting chemistry facts

20 interesting chemistry facts.

Coordination Number

In describing crystals, the number of nearest neighbours of an atom or ion. The number of donor atoms coordinated to a metal.