Oxygen is 46.6% by weight in the earth's crust
|Oxygen Atomic Number||: 8|
|Oxygen Atomic Mass||: 16|
|Oxygen Electronic Configuration||: [He]2s22p4|
|Oxygen Group Number||: 16 (VlA)|
|Oxygen Period Number||: 2|
|Oxygen Relative Abundance||: 1|
Oxygen is a most abundant element on earth. Oxygen is 46.6% by weight in the earth's crust. In atmosphere, oxygen is present 21% by volume.
Oxygen is the first member of "Chalcogen family".
Properties of Oxygen
- Oxygen is a gas while other family members are solids.
- Oxygen molecule is diatomic while the other family members exist in polyatomic ring form.
- Oxygen is non-metal whereas metallic character increases down the group. The non-metallic character of oxygen is due to its high value of electronegativity.
- Oxygen molecule is highly stable due to higher bond energy of multiple bonds.
- The atomic radius; atomic volume and density of oxygen are lower than rest of the family members.
- The ionisation energies of oxygen due to its smaller size is very high compared to that of the other family members.
- Oxygen is highly electronegative member of its family. It is the second most electronegative element after fluorine (4).
- The melting point -219C and boiling point -183C of oxygen are lower than that of other family members.
- Oxygen mostly exhibits oxidation state of -2. Oxygen do not have d-orbital hence can't show +4 +6 oxidation state while other family members can.
- Oxygen reacts with metal to form basic oxide.
K + O2 KO2 (Potassium super oxide)
2Mg + O2 2MgO (Magnesium oxide)
- It reacts with non-metal to form acidic oxide.
C + O2 CO2
S + O2 SO2
4P + 5O2 P4O10
- It reacts with some metals to form amphoteric oxides (acidic as well as basic)
4Al + 3O2 2Al2O3
2Be + O2 2BeO
2Zn + O2 2ZnO
- It reacts-with some non-metals to form neural oxide
C + O2 CO
N2 + O2 2NO
- It acts as oxidising agent. It is trequired for combusion. It is used for roasting of sulphide ores.
CS2 + 3O2 CO2 + 2SO2
2ZnS + 3O2 2ZnO + 2SO2