Activity 15. Electron Configurations Guided Examples
Skyline College Chemistry 210 Laboratory Manual (Spring 2016 Revision - JM)
5
Electron Configuration Practice
Write abbreviated ground state electron configurations for the following atoms or ions.
(remember, several “exceptions” are included)
1) Ge
2) Ta
3) Ni2+
4) Fe2+
5) Fe3+
6) La
7) As5+
8) Au
Skyline College Chemistry 210 Laboratory Manual (Spring 2016 Revision - JM)
6
Electron Configuration Worksheet
1. What is the subshell designation (e.g. 2p, 3d…) for the following cases?
a) n = 2, l = 0 _________________
b) n = 4, l = 3 _____________
c) n = 5, l = 1 _________________
d) n = 3, l = 0 _____________
e) n = 6, l = 1 _________________
f) n = 5, l = 2 _____________
2. The quantum numbers listed below are for 4 different electrons in the same atom. Arrange
them in order of increasing energy.
a) n = 4, l = 0, ml = 0, ms = ½
____________ least energy
b) n = 3, l = 2, ml = 1, ms = ½
____________
c) n = 3, l = 2, ml = -1, ms = ½
____________
d) n = 3, l = 1, ml = 1, ms = -½
____________ highest energy
Do any have the same energy? ____________ which ones? _____________
3. Write the complete electron configuration (simplified) for the following, using only the
periodic table as a guide (do not use noble gas core configuration):
a) Cd _________________________________________________
b) As __________________________________________________
c) Sr __________________________________________________
d) Sb __________________________________________________
e) S ___________________________________________________
4. Write the outer shell electron configurations for the following, using the periodic table as a
guide (this means use the noble gas core configurations)
a) K _________________________________________________
Skyline College Chemistry 210 Laboratory Manual (Spring 2016 Revision - JM)
7
b) Fe _________________________________________________
c) Bi __________________________________________________
d) F ___________________________________________________
5. Give outer-shell configuration for the following ions (Noble gas core):
a) Te2- _______________________________________________
b) Rb+ ________________________________________________
c) Br- _________________________________________________
d) Mn2+ _______________________________________________
e) Cr3+ ________________________________________________
6. Which has the LARGER ionization energy?
a) B or Cl
b) N or P
c) Hf or Cs
d) Ga or Ge
e) K or K+
f) Cs+ or Ba+
7. Which has the most EXOTHERMIC electron affinity?
a) Cl or Ar
b) Se or Br
c) Si or P
d) Fr or F
e) Se or Se-
f) Pb or Po
8. Which of the following are DIAMAGNETIC?
a) Sn ________________________
b) Hg ____________________
c) Sr _________________________
d) Sb ____________________
e) Ir __________________________
f) Br- ____________________
9. What is the Pauli exclusion principle
Skyline College Chemistry 210 Laboratory Manual (Spring 2016 Revision - JM)
8