Spectroscopy, Light, and Electrons ❮ 143- Which of the following represents the electron
arrangement for the least reactive element?
(A) 1s ↑ 2s ↑↓
(B) 1s↑↓ 2s ↑
(C) [Kr] 5s ↑↓ 4d ↑ ↑ (^) –––
(D) 1s ↑↓ 2s ↑↓ 2p ↑↓ ↑↓ ↑↓
- Which of the following might refer to a transi-
tion element?
(A) 1s ↑ 2s ↑↓
(B) 1s ↑↓ 2s ↑
(C) [Kr] 5s ↑↓ 4d ↑ ↑ (^) –––
(D) 1s ↑↓ 2s ↑↓ 2p ↑↓ ↑↓ ↑↓
- Which of the following electron arrangements
refers to the most chemically reactive element?
(A) 1s ↑ 2s ↑↓
(B) 1s ↑↓ 2s ↑
(C) [Kr] 5s ↑↓ 4d ↑ ↑ (^) –––
(D) 1s ↑↓ 2s ↑↓ 2p ↑↓ ↑↓ ↑↓
- Which of the following electron arrangements
represents an atom in an excited state?
(A) 1s ↑ 2s ↑↓
(B) 1s ↑↓ 2s ↑
(C) [Kr] 5s ↑↓ 4d ↑ ↑ (^) –––
(D) 1s ↑↓ 2s ↑↓ 2p ↑↓ ↑↓ ↑↓
- The ground-state configuration of Fe^2 + is which
of the following?
(A) 1s^2 2s^2 2p^6 3s^2 3p^6 3d^5 4s^1
(B) 1s^2 2s^2 2p^6 3s^2 3p^6 3d^6
(C) 1s^2 2s^2 2p^6 3s^2 3p^6 3d^6 4s^2
(D) 1s^2 2s^2 2p^6 3s^2 3p^6 3d^8 4s^2 - Which of the following contains only atoms that
are diamagnetic in their ground state?
(A) Kr, Ca, and P
(B) Ne, Be, and Zn
(C) Ar, K, and Ba
(D) He, Sr, and C
Experiments
No experimental questions related to this chapter have appeared on the AP exam in recent years.Common Mistakes to Avoid
- Be sure not to confuse wavelength and frequency.
- The speed of light is 3.0 × 108 m/s. The exponent is positive.
- The value of n is never zero.
- The values of l and ml include zero.
- Do not confuse velocity (v) and frequency (n).
❯ Review Questions
Use these questions to review the content of this chapter and practice for the AP Chemistry
exam. First are 16 multiple-choice questions similar to what you will encounter in Section I
of the AP Chemistry exam. Following those is a long free-response question like the ones
in Section II of the exam. To make these questions an even more authentic practice for the
actual exam, time yourself following the instructions provided.Multiple-Choice Questions
Answer the following questions in 25 minutes. You may not use a calculator. You may use
the periodic table and the equation sheet at the back of this book.STRATEGYTIP