1. Chapters 6, 7, 8, and 9

2.  Electronic structure of atoms:  Electromagnetic Radiation:

3.  Yellow light has a wavelength of 589 nm. What is the frequency of this radiation?

4.  E = hv  Calculate the energy of one photon of yellow light with a wavelength of 589 nm.

8. 1) Which of the following pairs are isoelectronic? a) Kr -, Br + b) F -, Na + c) Sc, Ti - d) Be 2+, Ne e) Cs, Ba 2+

9. 2) Which of the following electron configurations represents an atom in an excited state? a) 1s 2 2s 2 2p 5 b) 1s 2 2s 2 2p 5 3s 2 c) 1s 2 2s 2 2p 6 3s 1 d) 1s 2 2s 2 2p 6 3s 2 3p 5 e) 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1

10.  The periodic table:

15.  Which of the following properties generally decreases from left to right across a period?  (A) Electronegativity  (B) Electron affinity  (C) Atomic number  (D) Atomic Radius  (E) Maximum value of oxidation number

16.  Which of the following explains why the Cl - ion is smaller than the S 2- ion.  (A) Cl- has a more massive nucleus than S 2-  (B) Cl- has a higer electronegativity than S 2-  (C) Cl- has a greater nuclear charge than S 2-  (D) Cl- has a greater number of electrons than S 2-  (E) Cl- has more nucleons than S 2-

26.  Some molecules have more than one possible correct Lewis structure.

34.  Which of the following molecules has the shortest bond length?  (A) N 2  (B) O 2  (C) Cl 2  (D) Br 2  (E) I 2

35.  Which of the following molecules is non- polar?  (A) HCN  (B) NH 3  (C) SO 2  (D) NO 2  (E) PF 5

36.  Of the following compounds which is most ionic?  (A) SiCl 4  (B) BrCl  (C) PCl 3  (D) Cl 2 O  (E) CaCl 2