**QUIZ 8 – Chapter 6** **Total time: 10 minutes**

### Part I. (8 points) Multiple-choice questions **Question 1:** The red line ($\lambda = 656.28 \text{ nm}$) in the hydrogen spectrum are due to transition from a level for which $n_i > 2$ to the $n_f = 2$ level. What is the value of $n_i$? * **A.** 3 * **B.** 4 * **C.** 5 * **D.** 6 **Question 2:** What orbitals do the following shapes represent? ![Quiz-8-Q2.png](./images/Quiz-8-Q2.png) * **A.** $s$ and $f$ * **B.** $p$ and $d$ * **C.** $p$ and $f$ * **D.** $s$ and $p$ **Question 3:** According to the generalised formula stated by Bohr's model, we know the energy of an electron in an hydrogen atom in the ground state is $-13.6 \text{ eV}$. What will be its energy in the second excited state? * **A.** $5.6 \text{ eV}$ * **B.** $-1.51 \text{ eV}$ * **C.** $-2.35 \text{ eV}$ * **D.** $-3.4 \text{ eV}$ **Question 4:** The following diagram shows an atom at its ground state. [↑↓] [↑↓] [↑↓] [↑↓] [ ] * **A.** True * **B.** False ### Part II. (2 points) Long-answer question **Question 5:** Write the full and shortened electron configurations of $\text{Cr}$, $\text{Cr}^{+3}$, and $\text{Cr}^{+6}$. No explanation is required. | Atom/Ion | Full electron configuration | Shortened electron configurations | | :--- | :--- | :--- | | **Cr** | | | | **Cr⁺³** | | | | **Cr⁺⁶** | | |