Chemistry 100
Chapters 9-10 review
1. Write the complete orbital box diagram, electron configuration, and noble gas notation for
each of the following elements/ions:
a) Selenium, Z = 34
b) Cesium, Z = 55
c) As3-, Z = 33
d) Sr2+, Z = 38
2. Find the valence level and valence electrons for each of the elements/ions in problem 1.
3. Arrange the elements in each set in order of decreasing the size of the atom (by using only
the periodic table).
a) As, N, P, Sb
b) O, C, N, F
c) Be, Sr, Ca, Mg
d) As, Se, Ga, Br
4. Arrange the elements in each set in order of increasing ionization energy (by using only the
periodic table).
a) N, F, O, C
Dr. Behrang Madani
Chemistry 100
IVC
b) Cl, Br, I, F
c) Ca, Sr, Mg
d) Si, S, P
5. Find the location and the name of the following elements by using their electron
configurations.
a) 1s22s22p63s23p64s23d104p65s2
b) 1s22s22p63s23p64s23d104p65s24d105p4
c) 1s22s22p63s23p64s2
d) [Kr]5s1
6. What is the same and what is the different in the electron configuration of:
a) K and Cs
b) Cl and I
7. Arrange the elements in each set in order of increasing electronegativity (by using the
periodic table).
a) S, Al, P, Cl
b) Se, O, Te, S
c) Ba, Mg, Be
d) I, Te, Sb
8. Which wave has the higher energy?
a) λ = 0.006 cm or λ = 0.46 cm
b) ν = 85 Hz or ν = 43 Hz
9. Draw the Lewis structure for each covalent compound.
a) CH3OH
b) N2H4
Dr. Behrang Madani
Chemistry 100
IVC
c) H2S
d) CH3NH2
10. Predict the shape of each molecule and bond angles by using VSEPR.
a) CCl2F2
b) N2H4
c) H2O2
d) PCl3
11. In problem 10, which of the molecules are polar? Why?
12. In MgO, the electron configuration of magnesium ion and oxide ion are similar to which
noble gases?
13. Draw the Lewis structure for the following ions:
a) PO43-
b) NO3-
Dr. Behrang Madani
Chemistry 100
IVC
c) NH4+
d) HCO3-
14. Use the electron configuration of potassium and sulfur and then K+ and S2- to show how
an ionic bond is produced between them.
Dr. Behrang Madani
Chemistry 100
IVC