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Question

What is the number of valence electrons in :

(a) sodium ion, Na+

(b) oxide ion, O2–

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Solution

(a) Atomic number of sodium atom = 11
In Na+ ion, there are only 10 electrons. The electronic configuration is 2 , 8. Therefore, the number of valence electrons in sodium ion is 8.

(b) Atomic number of oxygen atom = 8
In O2- ion, there will be 10 electrons, as it has gained two electrons. The electronic configuration is 2, 8. Therefore, the number of valence electrons in O2- is 8.

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