Quantum Numbers of Valence Electron of Rubidium | JEE Main PYQ | Structure of Atom
Q. The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is:
(A) 5, 1, 1, +1/2
(B) 5, 0, 0, +1/2
(C) 5, 0, 1, +1/2
(D) 5, 1, 0, +1/2

Correct Answer: (B) 5, 0, 0, +1/2

Explanation

Rubidium (Z = 37) electronic configuration:

[Kr] 5s¹

Valence electron is in 5s orbital:

  • Principal quantum number, n = 5
  • Azimuthal quantum number, l = 0 (s-orbital)
  • Magnetic quantum number, ml = 0
  • Spin quantum number, ms = +1/2

Hence, correct set is (5, 0, 0, +1/2).

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