Question

Determine the number of protons, electrons, neutrons, valence electrons and valency in Oxygen
atom (O) and Oxide ion (O2-)
Compare the stability of an atom and an ion. (Atomic number of
Oxygen is 8)

Answer 1

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Answer :

For Oxygen atom :

1. No. Of protons = 8.
2. No. Of electrons = 8.
3. No. Of valence electrons = 6.
4. Valency = - 2.

For Oxide ion :

1. No. Of protons = 8.
2. No. Of electrons = 10.
3. No. Of valence electrons = 8.
4. Valency = 0.

• The oxide ion will be more stable than the oxygen atom, because its octet is complete.

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