For a one-electron atom, the set of allowed quantum numbers is –
(A) n = 1, l = 0, m1 = 0, ms = +½ (B) n = 1, l = 1, m1 = 0, ms = +½
(C) n = 1, l = 0, m1 = –1, ms = –½ (D) n = 1, l = 1, m1 = 1, ms = –½

• ans is option (A)
  for n=1, 'l' can have values=>0 to (n-1), i.e. 0 and ml can have values (-l to +l) i.e. 0 and ms can be +1/2 or -1/2....therefore....the first option is correct.
• 9 years agoHelpfull: Yes(0) No(0)