Chapter 5, Problem 5STP

Interpretation Introduction

Interpretation:

The maximum theoretical number of electrons related to the fifth principal energy level needs to be determined.

Concept introduction:

The Bohr’s atomic model purposed different energy levels in an atom in which electrons are placed according to their energy. The position and energy of electrons can be explained on the basis of different quantum number:

• Principle quantum number
• Azimuthal quantum number
• Magnetic quantum number
• Spin quantum number

Answer to Problem 5STP

Correct answer: Option D. is correct.

Explanation of Solution

Reason for correct option: The fifth shell or fifth energy level will have:

• 5 s = maximum 2 electrons
• 5p = maximum 6 electrons
• 5d = maximum 10 electrons
• 5f = maximum 14 electrons

Thus total 2+6+10+14 = 32 electrons can be occupied in 5^th principle energy level.

Conclusion

Reasons for incorrect options: The maximum number of electrons in an energy level must be sum of electrons in all sub-levels. Therefore it should be 32 electrons only.