PRESENTATION OUTLINE
Platinum is used to make coins
Platinum is an extremely rare metal
In the laboratory, platinum wire is used for electrodes.
short-term exposure to platinum salts may cause irritation of the eyes, nose, and throat
Elemental astatine has never been viewed
Many properties of astatine have been determined using tracer studies
The element was first produced at the University of California
It occurs on Earth only as the result of the radioactive decay of certain heavier elements.
It is an extremely radioactive synthetic element.
Roentgenium was first created in 1994 by the GSI Helmholtz Centre for Heavy Ion Research
Roentgenium has no stable or naturally-occurring isotopes
Roentgenium was first synthesized by an international team led by Sigurd Hofmann
gold structurally belongs to the isometric copper group.
This metal has been a valuable and highly sought-after precious metal for coinage, jewelry, and other arts since long before the beginning of recorded history.
A total of 174,100 tonnes of gold have been mined in human history
Most of the Earth's gold probably lies at its core
Tantalum is a rare, hard, blue-gray, lustrous transition metal
Tantalum was discovered in Sweden in 1802 by Anders Ekeberg
Tantalum forms oxides with the oxidation states
tantalum is estimated to make up about 1 ppm or 2 ppm of the Earth's crust by weight
The element was named for the color of its primary The most common naturally occurring minerals of barium are bariteoxide.
Barium is a soft, silvery-white metal, with a slight golden shade when ultrapure
The metal has been historically used to scavenge air in vacuum tubes
Barium occurs naturally on Earth as a mixture of seven primordial nuclides,
Carl Scheele identified barite as containing a new element in 1774,
