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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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