Oxygen (O)

Oxygen (O)

Oxygen is 46.6% by weight in the earth's crust

Oxygen (O)

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

  1. Oxygen is a gas while other family members are solids.

  2. Oxygen molecule is diatomic while the other family members exist in polyatomic ring form.

  3. 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.

  4. Oxygen molecule is highly stable due to higher bond energy of multiple bonds.

  5. The atomic radius; atomic volume and density of oxygen are lower than rest of the family members.

  6. The ionisation energies of oxygen due to its smaller size is very high compared to that of the other family members.

  7. Oxygen is highly electronegative member of its family. It is the second most electronegative element after fluorine (4).

  8. The melting point -219C and boiling point -183C of oxygen are lower than that of other family members.

  9. 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.

  10. Oxygen reacts with metal to form basic oxide.

    K + O KO(Potassium super oxide)

    2Mg + O 2MgO (Magnesium oxide)

  11. It reacts with non-metal to form acidic oxide.

    C + O2  CO2

    S + O SO2

    4P + 5O2  P4O10

  12. It reacts with some metals to form amphoteric oxides (acidic as well as basic)

    4Al + 3O 2Al2O3

    2Be + O 2BeO

    2Zn + O2  2ZnO

  13. It reacts-with some non-metals to form neural oxide

    C +  O2    CO

    N2 + O 2NO

  14. It acts as oxidising agent. It is trequired for combusion. It is used for roasting of sulphide ores.

    CS2 + 3O2  CO2 + 2SO2

    2ZnS + 3O 2ZnO + 2SO2

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