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Vishal Gupta • 7.73K Points
Tutor III Physics 

Q. Which of the following statements related to principal quantum number (n) is not correct?

  • (A) Energy of the orbital increases with increase of n
  • (B) Size of an orbital increases with increase of n
  • (C) The shell M is represented by principal quantum number 2
  • (D) Total number of allowed orbitals in Shell K is 1
Correct Answer - Option(C)
Explanation by: Vishal Gupta 
Statement 3 is incorrect. The shell M is represented by principal quantum number 3. Size of an orbital increases with increase of principal quantum number ‘n’. The energy of the orbital also increases with increase of n. Total number of allowed orbitals in Shell K is 1.

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