Question

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identify the complete electron configuration for an atom of
the element oxygen (o):

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$1s^{2}2s^{2}2p^{4}$
$1s^{2}2p^{4}$
$1s^{2}2s^{2}2p^{6}$
$1s^{2}2p^{4}$
$2s^{2}2p^{4}$
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Explanation:

Step1: Find oxygen's atomic number

Oxygen (O) has an atomic number of 8, so it has 8 electrons.

Step2: Fill orbitals by Aufbau principle

Fill lower energy orbitals first: 1s holds 2, 2s holds 2, remaining 4 go to 2p.
<Expression>
$1s^2 2s^2 2p^4$ (total electrons: $2+2+4=8$)
</Expression>

Step3: Match with options

Compare to given choices to find the correct one.

Answer:

1s² 2s² 2p⁴