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 Sulphur – Sulphur forms golden crystals.
Technetium (Tc)
Element 43 on the periodic table. An artificial radioactive, silvery metal that belongs to the transition metals.
It was the first element to be artificially produced in 1937 by Carlo Perrier and Emilio Segrè. It is used as a fuel in nuclear reactors.
Tellurium (Te)
Element 52 on the periodic table. A silvery-white metalloid in group 6 (the oxygen group).
It was discovered in 1782 by Franz Joseph Müller von Reichenstein.
A poor conductor of heat and a moderate conductor of electricity, it has not been widely used.
Terbium (Tb)
Element 65 on the periodic table. A silvery-white metal belonging to the rare-earth metals and one of the lanthanides.
It was discovered in 1843 by Carl Gustaf Mosander. It has few uses.
Thallium (Tl)
Element 81 on the periodic table. A blue-grey lead-like metal that is part of group 3 (the boron group).
It was discovered in 1861 by
Sir William Crookes. Thallium has no uses.
 Tarnish – Tarnishing over time can be seen with these three dated coins.
Thallium (Tl)
T
Tantalum (Ta)
Element 73 on the periodic table. This rare, very hard, silver-grey metal is one of the transition metals.
It is very dense and has a high melting point. It was discovered
in 1802 by the Swedish chemist Anders Gustaf Ekeberg and named
after the mythological character Tantalus. Its main use is in corrosion-resistant containers and in electrical components called capacitors.
Tarnish
A coating that develops as a result of a reaction between a metal and substances in the air. Most commonly, tarnishing forms an oxide.
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