Calcula el número de protones de electrones y de neutrones de los isótopos del oxígeno 0-16:0-17:0-18
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The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

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C. control over the business

Answer is (d)a brainliest would be appreciated