Question

In a multi-electron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic and electric fields?
i) $n=1,l=0,m=0$
ii) $n=2,l=0,m=0$
iii) $n=2,l=1,m=1$
iv) $n=3,l=2,m=1$
v) $n=3,l=2,m=0$

• A. ii and iv
• B. iv and v
• C. i and ii
• D. ii and iii

Answer 1

Answer: (B)

iv and v

In the absence of magnetic and electric fields, the atoms having the same value of $n$ and $l$ will possess the same electronic energy. So, $n$ and $l$ are same in case of option B.