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QUANTUM NUMBERS MCQs

Total Questions : 20 | Page 2 of 2 pages
Question 11. According to the Aufbau Principle, which sublevel should starting filling with electrons after 5s?
  1.    6s
  2.    5p
  3.    4d
  4.    3f
 Discuss Question
Answer: Option C. -> 4d
Question 12. Which of the following quantum number sets is not allowed?
  1.    { 3, 2, +1, -1/2 }
  2.    { 5, 3, -1, +1/2 }
  3.    { 12, 1, +2, +1/2 }
  4.    { 7, 6, -5, -1/2 }
 Discuss Question
Answer: Option C. -> { 12, 1, +2, +1/2 }
Question 13. How many valence electrons are in an atom of sulfur?
  1.    2
  2.    4
  3.    6
  4.    8
 Discuss Question
Answer: Option C. -> 6
Question 14. Which of the following sets of quantum numbers (n, l, ml, and ms) describes the valence electron of Na?
  1.    2, 1, 0, -½
  2.    2, 0, 0, -½
  3.    3, 1, 1, +½
  4.    3, 0, 0, +½
 Discuss Question
Answer: Option D. -> 3, 0, 0, +½
Question 15. How many orbitals are available to hold electrons in the 4th energy level (n=4)?
  1.    4
  2.    8
  3.    16
  4.    32
 Discuss Question
Answer: Option C. -> 16
Question 16. What is the noble gas configuration for Sulfur?
  1.    [Ar] 3p4
  2.    [He] 3s2 3p4
  3.    [Ne] 3s2 3p4
  4.    [Na] 3s2 3p4
 Discuss Question
Answer: Option C. -> [Ne] 3s2 3p4
Question 17. Write a set of quantum numbers for a 4d orbital
  1.    (4,1,0, -1/2)
  2.    (4,2,-2, +1/2)
  3.    (4,0,2,-1/2)
  4.    none of the above
 Discuss Question
Answer: Option B. -> (4,2,-2, +1/2)
Question 18. Electrons occupy orbitals of lowest energy first is part of what electron configuration rule?
  1.    Hund’s Rule
  2.    Aufbau Principle
  3.    Pauli Exclusion Principle
  4.    All of above
 Discuss Question
Answer: Option B. -> Aufbau Principle
Question 19. What is the correct representation for an orbital which has an "n" value of 4 and an "L" value of 2?
  1.    4d
  2.    4s
  3.    4f
  4.    4p
 Discuss Question
Answer: Option A. -> 4d
Question 20. For a principle quantum number, "n", equal to 2, what is the total electron capacity of that level?
  1.    2
  2.    4
  3.    8
  4.    16
 Discuss Question
Answer: Option C. -> 8

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