**QUIZ 9 – Chapter 7** **Total time: 10 minutes**

### Part I. (8 points) Multiple-choice questions **Question 1:** In which orbital does an electron in a phosphorus atom experience the greatest effective nuclear charge? * **A.** 1s * **B.** 2s * **C.** 2p * **D.** 3s **Question 2:** Arrange $\text{F}$, $\text{Br}$, and $\text{Br}^-$ in order of increasing size. * **A.** $\text{F} < \text{Br} < \text{Br}^-$ * **B.** $\text{Br}^- < \text{Br} < \text{F}$ * **C.** $\text{Br} < \text{F} < \text{Br}^-$ * **D.** $\text{Br} < \text{Br}^- < \text{F}$ **Question 3:** If the electron affinity for an element is a negative number, does it mean that the anion of the element is more stable than the neutral atom? * **A.** Yes * **B.** No **Question 4:** What is the trend in first ionization energies as one proceeds down the Group 4A elements? * **A.** unchanged * **B.** not predictable * **C.** increased * **D.** decreased ### Part II. (2 points) Long answer question **Question 5:** Calculate the effective nuclear charge ($Z_{\text{eff}}$) of a valence electron of chlorine. Write equations that show the processes that describe the first, second, and third ionization energies of a chlorine atom. Which process would require the least amount of energy and why?