Additional Practice Problems, Chapter 7 1. Which ion has the smallest radius? (A

Question

Additional Practice Problems, Chapter 7 1. Which ion has the smallest radius? (A). F (B). Ar (C).I 2. Which of the following is the correct electron configuration for selenium (Se, Z-34)? (D). CI, (D), Br (B). 1s 2s22p 3s 3p 4s 4p (D). 1s2s 2p 3s 3p 4s'4d104p 3. What is the ground state electron configuration for Cr (chromium)? Hint: Cr has half-filled d orbitals. (A). Cr: [Ar)5s 4d (B). Cr: [Ar]5s 4d (C). Cr: [Ar]4s 3d (D). Cr: [Arj4s 3d (E). Cr: [Arj5s 4d 4. Which element is the largest in the following? 5. Which element has the 3s and 3p electrons? Select all that apply 6. Which of the following is the correct electron configuration for the anion typically formed from (A). N (B). Mo (C).Se (D).Fr (E). Kr (A). P (B). Cl (C), O (D), F (E). S nitrogen? (A). 1s22s?2p (B). 1s2s 2p (C). 1s 2s22p (D). 1s 2s 2p (E). 1s 2s 2ps 7. Aluminum is a metal and tends to lose electrons to form A cation 9 (A). N t reacts ie than 9. Both Ne and AP are isoelectronic. (A). True 10. Write the electron configuration and orbital diagram for Ca2 ion. 11. Chlorine is a halogen. It reacts with sodium to form sodium chloride, which is an ionic compound Radius of Al is smaller than the radius ofA (a).True (B).False 8. Which element reacts violently with water? (A). Na (B). K (C).O (D). He (E). Be (B). False (A) 1s?2s 2p 3s23p6 (D) 1s 2s 2p38'3 (B) 1s 25 2p 3s 3p 4s? (E) 1s 2s2p 3s 3p 4s24p (C) 18 282p 38 4p (A). True (B). False Radius of CI is smaller than that of Ch 12. In general, a valence shell is (A). the lowest energy level occupied by electrons. (B). the set of orbitals used to make triple bonds. (C). the orbitals belonging to the entire molecules. (D) the highest energy level occupied by electrons.

Explanation / Answer

1. Option A, F- since smaller in size

2. Option C, orbitals fill /c to energy level

3. Option D, exception for chromium due to half filled 3d5 is more stable

4. Option D, Fr since atomic no is 87

5. Options, A, B, and E, P, Cl and S with atomic no - 15,17&16

6. Option A, Nitrogen forms azide anion N3-

7. False since neutral element has more radius than cation

8. Option A, Na

9. Option True, both have 10 electrons

10. Option A, ca+2 has 18 electrons

11. Option True radius of anion is greater than the parent element.

12. Option D

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