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Elements with properties intermediate between metals and nonmetals: B, Al, Si, Ge, As, Sb, Te, Po, and At.

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DP number

The degree of polymerization, the average number of monomer units per polymer unit.

Mass Spectrometer

An instrument that measures the charge-to-mass ratio of charged particles.

Electron

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

History of fireworks

There is an assumption that the history of fireworks started in China, about 2000 years ago. It is possible that the Chinese accidentally discovered explosions by burning bamboo canes.

Exothermic

Describes processes that release heat energy.

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.

Homogeneous Mixture

A mixture which has uniform composition and properties throughout.

Basic Salt

A salt containing an ionizable OH group.

Dimer

Molecule formed by combination of two smaller (identical) molecules.

Frequency

The number of repeating corresponding points on a wave that pass a given observation point per unit time.