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Structure of Atom

JEE Main 2024 (Online) 29th January Morning ShiftMCQEasy📈 Topic in 17% papers+4−1
Ques. 1JEE Main 2024, 29 January (Morning Shift)

The correct set of four quantum numbers for the valence electron of rubidium atom (Z=37) is :

  1. 5, 1, 1, + 12
  2. 5, 0, 0, + 12
  3. 5, 0, 1, + 12
  4. 5, 1, 0, + 12

Answer

(2) 5, 0, 0, + 12

Solution

Rb (Z = 37): [Kr] 5s1 ⇒ valence electron in 5s

n = 5, l = 0 (s), m = 0 (only value for l = 0), s = + 12

(A), (D): l = 1 means a p-orbital ⇒ wrong

(C): m = 1 is not allowed for l = 0 ⇒ wrong

Answer: (2)

Keep practising — Structure of Atom

Ques. 2JEE Main 2024, 29 January (Evening Shift)

Match List I with List II Choose the correct answer from the options given below:

  1. A-II, B-IV, C-III, D-I
  2. A-I, B-III, C-II, D-IV
  3. A-II, B-III, C-I, D-IV
  4. A-I, B-II, C-III, D-IV
Ques. 3JEE Main 2024, 27 January (Morning Shift)

The number of electrons present in all the completely filled subshells having n = 4 and s = + 12 is . (Where n = principal quantum number and s = spin quantum number)

Ques. 4JEE Main 2024, 27 January (Evening Shift)

Total number of ions from the following with noble gas configuration is . Sr2+ (z = 38), Cs+ (z = 55), La2+ (z = 57), Pb2+ (z = 82), Yb2+ (z = 70) and Fe2+ (z = 26)

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