The correct order of energy for orbitals is:

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(A) According to the $(n+l)$ rule,the energy of an orbital increases as the value of $(n+l)$ increases.For a given $(n+l)$ value,the orbital with the

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$ns < np < (n-1)d < (n-2)f$

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(A) According to the $(n+l)$ rule,the energy of an orbital increases as the value of $(n+l)$ increases.For a given $(n+l)$ value,the orbital with the lower $n$ value has lower energy.Following the Aufbau principle,the sequence of energy levels is $ns However,based on the $(n+l)$ rule,the general increasing order of energy is $ns < (n-2)f < (n-1)d < np$ is not universally true for all $n$. Given the options,the standard order of increasing energy is $ns < (n-2)f < (n-1)d < np$ is often represented as $ns < (n-2)f < (n-1)d < np$.

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