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Cobalt Element Project
25
Cobalt
Under the lens
By LESLEY hERNANDEZ
Period 4
dR. bUTLER
General Info
Discoverer & Location
ATOMIC Number
Cobalt was found in 1735 by a Swedish chemist and mineraligist named Georg Brandt. He was trying to prove that cobalt made blue glass instead of bismuth. Major cobalt deposits are found in the DR of Congo, Canada, Australia, Zambia, and Brazil.
Symbol
Atomic Mass
Uses
Number of Protons, Neutrons, & Electrons
Lewis Dot Diagram
Cobalt is used in magnetic steels and stainless steels, and in alloys used in aircraft engine parts. Its salts are used to make the color blue in glass and ceramics. Cobalt-60 is used to create gamma rays which are used to treat cancer and disinfect medical supplies.
Co
Protons
Neutrons
Electrons
Did you pay Attention?
THE END
1. Who discovered cobalt?
George Brandt
OR
2. Name one place where cobalt is found in the world?
DR of Congo, Canada, Austrailia, Zambia,
and Brazil
3. Name some physical properties of cobalt.
Properties
hard, gray, somewhat malleable, and lustrous
Physical Properties
Cobalt is a hard, brittle, gray metal that looks similar to iron and nickel. It is also somewhat malleable. The melting point of cobalt is 1,495° C (1768 K), and the boiling point is about 2880°C (3153 K). The density is 8.9 grams per cubic centimeter.
Electronic Configurations
Chemical Properties
The element cobalt is somewhat reactive. It combines gradually with oxygen in the air, but won't catch on fire and burn unless it is in a powder form. Cobalt reacts with most acids to make hydrogen gas, it doesn't react with water at room temperature.
Long Form
1s 2s 2p 3s 3p 4s 3d
SHORT FORM
[Ar]4s 3d