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1. complete electronic configuration abbreviated electronic config. valence electrons
a)  Fe 1s22s22p63s23p64s23d6 [Ar]4s23d6
2
b)  Er(aufbau) 1s22s22p63s23p64s23d104p65s24d105p66s25d14f11 [Xe]6s25d14f11
2
(mnemonic) 1s22s22p63s23p64s23d104p65s24d105p66s24f12 [Xe]6s24f12
2
c)  Se 1s22s22p63s23p64s23d104p4 [Ar]4s23d104p4
6
d)  Cs 1s22s22p63s23p64s23d104p65s24d105p66s1 [Xe]6s1
1
e)  Ag 1s22s22p63s23p64s23d104p65s14d10 [Kr]5s14d10
1

2. Draw the complete energy level diagram for Mo and describe its magnetic properties.

3. Describe a possible set of quantum numbers for the 6th, 22nd, 44th and 80th electrons in mercury. Using the Aufbau Principle

 6th - 2,1,0,+1/2

22nd - 3,2,1,+1/2

44th - 4,2,2,-1/2

80th - 5,2,-2,-1/2

4. Classify each of the following elements (based on their electronic configuration).
 

As - Representative  Ru - Transition
   
Cu - Transition Cm - Inner Transition

 

5. Determine the electronic configuration and draw the expected orbital for each of the following sets of quantum numbers.
 

3,1,-1,+½  - 3p3 5,0,0,-½ - 5s2
   
2,1,0,+½ - 2p2 4,2,-2,-½ - 4d10