Chapter 5, Problem 5STP

Solution

Interpretation : The maximum theoretical number of electrons related to the fifth principal energy level of an atom is to be identified.

Concept Introduction : Atomic orbitals' relative sizes and energies are represented by the primary quantum number (n). The orbital grows as n rises, the electron spends longer away from the nucleus, and the energy of the atom rises.

The correct answer is 50.

Option (d) is the correct answer.

The primary energy levels of the atom are defined by the principal quantum number, n. A principal energy level is used to describe each significant energy level.

Energy sublevels are included in principal energy levels.

Since it is the fifth principal energy level, n=5. The maximum number of orbitals is given as:

  $\begin{array}{c}{n}^2=5^2\\ =25\end{array}$

Each orbital will have two electrons so there are about 50 electrons in 25 orbitals.