Question

The correct set of four quantum numbers for the valence electron of potassium (atomic number 19) is ______.

Options

• 5, 0, 0, 1/2

• 4, 1, 1, 1/2

• 4, 0, 0, 1/2

• 4, 1, 0, 1/2

Answer 1

The correct set of four quantum numbers for the valence electron of potassium (atomic number 19) is 4, 0, 0, 1/2.

Explanation:

The electron configuration of potassium atom is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹.

Quantum numbers for the valence electron:

• Principle quantum number (n) is 4.
• Azimuth quantum number (l) for s-orbital is 0.
• Magnetic quantum numbers (m_l) for s-orbital is 0.
• Spin quantum numbers (s) is 1/2.