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A substance capable of causing or producing cancer in mammals.

 

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Linkage Isomers

Isomers in which a particular ligand bonds to a metal ion through different donor atoms.

 

Sigma Orbital

Molecular orbital resulting from head-on overlap of two atomic orbitals.

Kinetic Energy

Energy that matter processes by virtue of its motion.

Tyndall Effect

The scattering of light by colloidal particles.

Crystal Lattice

A pattern of arrangement of particles in a crystal.

Amphiprotism

Ability of a substance to exhibit amphiprotism by accepting donated protons.

Features of the Scanning Tunneling Microscope

The scanning tunneling microscope (STM) invented by Heinrich Rohrer and Gerd Binnig in the 1980s still manages to do a great job today and competes with more advanced microscope types.

The scanning tunneling microscope is used for studying the surface atoms that are found on various materials. The device is based on a complex process of "tunneling" electrons between the material and the tip of a probe.

Amine Complexes

Complex species that contain ammonia molecules bonded to metal ions.

Ester

A Compound of the general formula R-C-O-R1 where R and R1 may be the same or different, and may be either aliphatic or aromatic.

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.