In a multielectron atom, which of the following orbitals described by three quantum numbers will hav

Question

In a multielectron atom, which of the following orbitals described by three quantum numbers will have same energy in absence of electric and magnetic fields?\ A. $n=1, l=0, m_{l}=0$\ B. $n=2, l=0, m_{l}=0$\ C. $n=2, l=1, m_{l}=1$\ D. $n=3, l=2, m_{l}=1$\ E. $n=3, l=2, m_{l}=0$ \Choose the correct answer form the options given below :\

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(b) :\ A. $n=1, l=0, m_{l}=0 \quad 1 s$\ B. $n=2, l=0, m_{l}=0 \quad 2 s$\ C. $n=2, l=1, m_{l}=1 \quad 2 p$\ D. $n=3, l=2, m_{l}=1 \quad 3 d$\ E. $n=3, l=2, m_{l}=0 \quad 3 d$\ (D) and (E) will have same energy in absence of electric and magnetic fields.\