Question

Give a reason why oxygen gas is a diatomic molecule

Answer 1

Answer:

Oxygen generally exists as a diatomic molecule in the atmosphere when it is not combined with any other element. It forms the molecule O2 because in that configuration, it has its lowest energy level when uncombined. ... In order to become stable (attain low energy), it usually needs to gain 2 electrons.

Explanation:

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Answer 2

Oxygen having 6 electrons in outermost shell shares 2 of its electrons with another atom of oxygen.This forms a double covalent bond between the 2 atoms and completes their octet.

::O=O::

Oxygen has 3 forms-

[O] nascent oxygen,very unstable
O2- stable due to high bond dissociation enthalpy of double covalent bond.
O3- unstable, easily disociates to O2 and [O] on exposure of certain chemicals.( Ozone layer Depletion)