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Sunday, 28 December 2014

Element

A chemical element is a substance that contains only one type of atom.

118 different chemical elements are known to modern chemistry. 92 of these elements can be found in nature, and the others can only be made in laboratories.

English scientist John Dalton begun using symbols to represent the atoms of different elements on September 6, 1803.

The Periodic Table of the elements was invented and arranged by the Russian chemist Dmitry Ivanovich Mendeleyev (1834-1907).

Scottish chemist William Ramsay (1852-1916) discovered four elements, argon, neon, krypton, and xenon, and showed that they belong to a family of elements now called the noble gases.

The first man-made element was Technetium, in 1937.

The element Einsteinium-253 was discovered in 1952 and named after Albert Einstein. Einsteinium-253 does not occur in nature, but was first found in the nuclear fallout from an early hydrogen bomb test explosion in the South Pacific. It was found later in coral gathered in the area.

Astatine is an element so rare there's only one ounce of it in the world and it's radioactive.

The letter J does not appear anywhere on the Periodic Table.

The human body is made up of 26 elements.

A metalloid is a chemical element that has properties in between those of metals and nonmetals. The six commonly recognised metalloids are boron, silicon, germanium, arsenic, antimony and tellurium . Elements less commonly recognized as metalloids include carbonaluminium, selenium, polonium and astatine. 

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