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Structure of Atom

JEE Main 2024 (Online) 31st January Evening ShiftMCQEasy📈 Topic in 17% papers+4−1
Ques. 1JEE Main 2024, 31 January (Evening Shift)

The four quantum numbers for the electron in the outermost orbital of potassium (atomic no. 19) are

  1. n = 3, l = 0, m = 1, s = + 12
  2. n = 4, l = 0, m = 0, s = + 12
  3. n = 2, l = 0, m = 0, s = + 12
  4. n = 4, l = 2, m = -1, s = + 12

Answer

(2) n = 4, l = 0, m = 0, s = + 12

Solution

K (Z = 19): 1s2 2s2 2p6 3s2 3p6 4s1 ⇒ outermost electron in 4s

For 4s: n = 4, l = 0 ⇒ m = 0 (only value for l = 0), s = + 12

(A): l = 0 with m = 1 is impossible; (C): n = 2 is an inner shell; (D): l = 2 is a d orbital ⇒ all wrong

Answer: (2)

Keep practising — Structure of Atom

Ques. 2JEE Main 2024, 30 January (Morning Shift)

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

  1. Statement I is true but Statement II is false
  2. Statement I is false but Statement II is true
  3. Both Statement I and Statement II are false
  4. Both Statement I and Statement II are true
Ques. 3JEE Main 2024, 30 January (Evening Shift)

Number of spectral lines obtained in He+ spectra, when an electron makes transition from fifth excited state to first excited state will be

Ques. 4JEE 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
Ques. 5JEE 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. 6JEE 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. 7JEE 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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