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Question

What is the formula for the ion formed when oxygen obtains a noble gas configuration?

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Solution

An oxygen atom will gain electrons in order to achieve the electron configuration of the noble gas at the end of its period, which is neon.

The electron configuration of a neutral oxygen atom is1s22s22p4.

The electron configuration of the noble gas neon is 1s22s22p6.

An oxygen atom must gain two electrons in order to obtain the noble gas configuration of neon, with an octet of valence electrons.

The resulting oxide ion has a charge of 2, and its formula is O2

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