1. Cobalt
By Selena Pineda

2. Facts Located on the periodic table, period 4 group 9 Symbol: Co
Atomic number: 27
Atomic mass: 58.93
Transition metal

3. Atomic structure 27 protons 32 neutrons 27 electrons
4 energy levels, 2, 8,15,2

4. History Discovered by Georg Brandt in 1735 in Sweden
Trying to demonstrate the blue color of glass
The element is also found with bismuth

5. Found In In Geology Elements in the universe The sun Meteorites
Earth's crust

6. Uses
In Biology
Abundance in humans
Biological role
Health hazards

7. Reactions of Cobalt Air; not reactive Water; little reaction
Halogens; direct reaction
Acids; dissolves slowly
Cobalt is not particularly reactive with air. However on heating the oxide Co3O4 is formed. If the reaction is carried out above 900°C, the result is cobalt(II) oxide, CoO. Cobalt does not react directly with nitrogen, N2
. Water has little effect upon cobalt metal. The reaction between red hot cobalt metal and steam produces cobalt(II) oxide, CoO
The dibromide cobalt(II) bromide, CoBr2, is made through the direct reaction between cobalt metal and bromine.
Cobalt metal dissolves slowly in dilute sulphuric acid to form solutions containing the aquated Co(II) ion together with hydrogen gas, H2. In practice, the Co(II) is present as the complex ion [Co(OH2)6]2