1. COBALT
By Hart Mechlin

2. Discovery of Cobalt
Cobalt has been known for centuries particularly for the distinctive blue color it gives to glass.
Cobalt has been used since as early as Pompeii (79 AD) to achieve a deep blue colored glass.
In 1735 cobalt was isolated and regarded as an element by Swedish chemist Georg Brandt
Brandt discovered cobalt in an effort to discern what element was responsible for the rich blue color in certain glass; before cobalt it was believed to be bismuth.
Cobalt Glass
Georg Brandt
“Cobalt” comes from the German word for goblin, “Kobold,” as well as the Greek word for mine, “Cobalos.”

3. Elemental Characteristics
High strength, high toughness metal
Resistant to corrosion and oxidation
High melting point; strong under high temperatures
Cobalt is a lustrous, tough, silver-blue transition metal
Density
8.9 g/cm3
Melting Point
1495°C
Boiling Point
2870°C
Atomic Mass (Avg.) g

4. Sources of Cobalt Ores containing Cobalt: - Co3S4 (Linnaeite)
- CoAsS (Cobaltite)
- CoAs2 (Smaltite)
Ores are roasted to obtain various metals including Co, Ni, Pb
Cobalt is also a byproduct of the productions of iron, nickel, and lead
Common Cobalt
Ore
Cobalt deposits found in Zaire, Australia, Russia, and Canada
Cobalt is also present in meteors

5. Uses for Cobalt
Used in creation of superalloys, which are used in gas turbine aircraft engines
Used for magnets
Combines to create: high speed steels; corrosion and oxidation resistant metals; hardmetals for diamond tools (cemented carbides)
Catalysts for petroleum and chemical industries
Cobalt-60 is an artificial isotope of cobalt. It has various uses in medicine, involving sterilization of equipment, use as a radioactive power source, and also use as a radiation source in medical radiotherapy for cancer.
Cobalt
Magnets

6. VEGEMITE

7. Bohr-Rutherford Diagram
Atomic Number: 27
Valence Electrons: 2

8. THE END