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Write the electron configuration (s, p, etc.) of the oxygen (oxide) ion (O$^{2-}$). - Leaving Cert Chemistry - Question a - 2010
Question a
Write the electron configuration (s, p, etc.) of the oxygen (oxide) ion (O$^{2-}$).
Worked Solution & Example Answer:Write the electron configuration (s, p, etc.) of the oxygen (oxide) ion (O$^{2-}$). - Leaving Cert Chemistry - Question a - 2010
Step 1
Write the electron configuration of O$^{2-}$
Answer
The oxygen atom has 8 electrons in its neutral state, represented by the electron configuration:
When it becomes an oxide ion (O), it gains 2 additional electrons, resulting in a total of 10 electrons. The new electron configuration is:
Alternatively, this can also be expressed as:
where [He] stands for the electron configuration of helium, which is commonly used for shorthand notation.