ELEMENTS

SELENIUM

• Symbol: Se
• Solid
• Deep red; crystalline hexagonal selenium, the most stable, is a metallic grey
• Atomic weight: 78.96
• Atomic number: 34

SELENIUM

• Discovered: 1817
• Discover: Jons Berzelius
• Discovered in Sweden

SELENIUM

• Used in the glass industry
• Used as a catalyst in many chemical reactions
• Used in solar cells & photo cells
• Used as a photographic toner

RUBIDIUM

• Atomic weight: 85.4678
• Symbol: Rb
• Atomic number: 37
• Silvery white color
• Solid

RUBIDUIM

• Discover: Robert Bunsen
• Discovered: 1861
• Discovered in Germany

RUBIDIUM

• Used in vacuum tubes
• Used in the manufacture of photocells
• Used in special glasses
• Might be used as a propellant in ion engines on spacecraft

TECHNETIUM

• Atomic weight: 98.9063
• Symbol: Tc
• Atomic number: 43
• Silvery grey metallic color
• Solid

TECHNETIUM

• Discovered: 1937
• Discover: Carlo Perrier & Emilo Segre
• Discovered in Italy

TECHNETIUM

• Used for medical research purposes
• Used as a radioactive tracer

TUNGSTEN

• Atomic weight: 183.84
• Symbol: W
• Atomic number: 74
• Solid
• Grayish- white lustrous metal

TUNGSTEN

• Discover: Fautso & Juan Jose de Elhuyar
• Discovered: 1783
• Discovered in Spain

TUNGSTEN

• Used in heavy metal alloys
• Used in superalloys
• Used in many high temperature applications