YOUR NAME 
Chemistry 1201 Lecture Section 2
HOMEWORK #3 due on Tuesday, March 26, 2002
In questions 1-6 circle the answer options you believe are correct. 
STAPLE your work to this answer sheet and hand in to me in class.
The maximum score attainable is 25.

Q1 (2 marks): Which of the following represents an acceptable possible set of n, l, ml, and msquantum numbers
for an electron in an atom?
 
a) 2, 1, -1, 0 b) 2, 1, 0, 1/2 c) 2, 2, 3, 1/2 d) 2, 0, 1, -1/2 e) 2, 0, 2, 1/2

Q2 (2 marks): Which orbital is degenerate with a 4dz2 in a many-electron atom?
 
a) 4pz b) 4dz c) 4s d) 4dx2-y2 e) 5dz2

Q3 (2 marks): When an atom is excited, even though the total number of electrons does not change,
the electron configuration is no longer the same as the ground state electron configuration you have learnt to derive.
Which of the following electron configurations corresponds to an excited fluorine atom?
 
a) 1s2 2s2 2p5 b) 1s2 2s2 2p2 3s2 c) 1s2 2s2 2p4 3s1 d) 1s2 2s2 2p4 e) [He] 2s3 2p5

 

Q4 (2 marks): Screening by the core electrons in atom is:
 
a) less efficient than that by valence electrons
b) more efficient than that by the valence electrons
c) essentially identical to that by valence electrons
d) responsible for a general decrease in atomic radius going down the group
e) both essentially identical to that by valence electrons and responsible for a general decrease in atomic radius going down the group

 
 
Q5 (2 marks): Which one gives the correct order for bonding atomic radius (from the smallest to the largest) Q6 (2 marks): Which one gives the correct order for first ionization energy (from the largest to the smallest)
a) F < K < Ge < Br < Rb a) Ne > O > C > Be > Li
b) F < Ge < Br < K < Rb b) O > C > Ne > Be > Li
c) K < F < Br < Rb < Ge c) Ne > C > O > Be > Li
d) F < Br < Ge < K < Rb d) O > Ne > C > Be > Li
e) Rb < K < Ge < Br < F e) O > Ne > C > Li > Be

Provide answers to the remaining questions in the appropriate lines or boxes

Q7 (2 marks) Complete the following sentences: magnesium is a                                     (metal, nonmetal).

It forms a (an)                                    (basic, acidic) oxide which, when dissolved in water forms a (an)

                                  (base, acid) with the formula of                                    and name:                                                                     .
 
 

Q8 (3 marks): a) Write the full ground state electron configuration for bizmuth:
 
Answer:
b) Which electrons in the above electron configuration are valence electrons? Answer:

 

Q9 (3 marks): a) Draw orbital diagram (see such orbital diagrams for Zn and Ti on page 214 in BLB)
for the short hand electron configuration of cobalt.
 
Answer:

 

 
 
b) Which electrons in the above electron configuration are valence electrons? Answer:
c) What would be the expected charge of a cobalt cation? Answer:

Provide detailed work for question 10 on a separate piece of paper

Q10 (5 marks) a) Derive the "general valence electron configuration" for the elements in group VIIA.

Hint: In this question you are asked to write electron configurations (full or short hand) for at least four elements in group VII
and pointing to the common features (see similar treatment for group IA metals in your class notes from March 14).
 
"general valence electron configuration":
b) What is the charge of the most common ion elements in group VIIA will form? Make sure you also provide justification for your answer. Answer: