CBSE Class 11 Chemistry Quantum Model of Atom MCQ Exam

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Questions and Answers

The principle quantum number specifies the:

  • Electron spin
  • Magnetic field around the electron
  • Energy level of the electron (correct)
  • Shape of the orbital

Which of the following values is NOT a valid principle quantum number?

  • 1
  • 3.5 (correct)
  • 4
  • 2

What is the maximum number of electrons that can be present in a shell with principal quantum number n = 3?

  • 10
  • 8
  • 6 (correct)
  • 18

Which of the following is the correct electronic configuration for a neutral atom of sodium (atomic number 11)?

<p>1s^2 2s^2 2p^6 3s^1 (A)</p> Signup and view all the answers

What is the maximum number of electrons that can occupy a 3d orbital?

<p>6 (B)</p> Signup and view all the answers

What is the angular momentum quantum number (l) for a 4f orbital?

<p>3 (A)</p> Signup and view all the answers

Which of the following indicates a higher energy level and farther from the nucleus?

<p>Higher energy level and farther from the nucleus (D)</p> Signup and view all the answers

The angular momentum quantum number 'l' defines the:

<p>Shape of the orbital within a subshell (C)</p> Signup and view all the answers

Which of the following determines the possible values of the angular momentum quantum number 'l'?

<p>All of the above (D)</p> Signup and view all the answers

An electron in the d subshell has an angular momentum quantum number (l) of:

<p>1 or 2 (A)</p> Signup and view all the answers

The magnetic quantum number 'm_l' specifies the:

<p>Orientation of the orbital in space (A)</p> Signup and view all the answers

For a p subshell (l = 1), how many possible values of m_l exist?

<p>3 (C)</p> Signup and view all the answers

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Study Notes

Principle Quantum Number (n)

  • Specifies the energy level of the electron
  • Determines the size of the orbital
  • Can have values of 1, 2, 3, ... (any positive integer)
  • Not a valid principle quantum number: 0, 5.5
  • Higher the value of n, indicates a higher energy level and farther distance from the nucleus

Angular Momentum Quantum Number (l)

  • Defines the subshell of the electron
  • Possible values depend on the value of n
  • Range: 0 to n-1
  • For a given n, possible values of l: 0, 1, 2, ..., n-1
  • For a d subshell, l can be 0, 1, 2, or 3

Magnetic Quantum Number (m_l)

  • Specifies the orientation of the orbital in space
  • Possible values: -l to +l
  • For a p subshell (l = 1), possible values of m_l: -1, 0, +1
  • Total number of possible values of m_l is 2l + 1

Shape of Orbital and Orbital Angular Momentum

  • s-orbitals are spherical in shape
  • Orbital angular momentum of an electron is directly proportional to the angular momentum quantum number (l)

Number of Orbitals and Electrons

  • Total number of orbitals in a shell with principal quantum number n: n^2
  • Number of orbitals in a p subshell: 3
  • Maximum number of electrons that can be accommodated in a shell with n = 3: 18

Spin Quantum Number (m_s)

  • Can have values of +1/2 or -1/2
  • Electrons with opposite spins have the same energy

Electronic Configuration

  • Electronic configuration of Neon (Ne): 1s^2 2s^2 2p^6
  • In a filled subshell, all orbitals are fully occupied with electrons

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