Having similar energy in the absence magnetic field, Chemistry

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In a multi-electron atom, which of the following orbitals described by the three quantum members will have the same energy in the absence of magnetic and electric fields:

(1)n=1, l=0, m=0              

(2) n=2, l=0, m=0           

(3) n=2, l=1, m=1                          

(4) n=3, l=2, m=0

(5) n=3, l=2, m=0

(1) (1) and (2)     (2) (2) and (3)     (3) (3) and (4)      (4) (4) and (5)

Ans:  (4) and (5)

 


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