12 Questions
The principle quantum number specifies the:
Energy level of the electron
Which of the following values is NOT a valid principle quantum number?
3.5
What is the maximum number of electrons that can be present in a shell with principal quantum number n = 3?
6
Which of the following is the correct electronic configuration for a neutral atom of sodium (atomic number 11)?
1s^2 2s^2 2p^6 3s^1
What is the maximum number of electrons that can occupy a 3d orbital?
6
What is the angular momentum quantum number (l) for a 4f orbital?
3
Which of the following indicates a higher energy level and farther from the nucleus?
Higher energy level and farther from the nucleus
The angular momentum quantum number 'l' defines the:
Shape of the orbital within a subshell
Which of the following determines the possible values of the angular momentum quantum number 'l'?
All of the above
An electron in the d subshell has an angular momentum quantum number (l) of:
1 or 2
The magnetic quantum number 'm_l' specifies the:
Orientation of the orbital in space
For a p subshell (l = 1), how many possible values of m_l exist?
3
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
Prepare for your CBSE Class 11 Chemistry exam with this 100 multiple-choice questions paper focusing on the quantum mechanical model of the atom. Test your knowledge on topics like principle quantum number, orbital shapes, and electron configurations.
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