Chapter 11, Problem 2STP

Interpretation Introduction

Interpretation: The number of electrons that can be contained in all of the orbitals with a principal energy level of 3 ( n = 3) needs to be determined.

Concept introduction:Principle quantum number, n describes the energy level of an atom.

Answer to Problem 2STP

D. 18

Explanation of Solution

Since, it is known that $\text{n}=1$ can contain 2 electrons

$\text{n}=2$ can contain 8 electrons

$\text{n}=3$ can contain 8 electrons

and $\text{n}=4$ can contain 32 electrons

Therefore, $\text{n}=3$ contains 18 electrons.

Conclusion

Principle quantum number describes the size in space of the orbital of the atom.