Cu _____1s²,2s²,2p⁶,3s²,3p⁶,4s¹,3d¹⁰                                       ____[Ar] 4s¹,3d¹⁰______

Cr _____1s²,2s²,2p⁶,3s²,3p⁶,4s¹,3d⁵                                         ____[Ar] 4s¹,3d⁵_______

Fe³⁺ ___1s²,2s²,2p⁶,3s²,3p⁶,4s⁰,3d⁵                                          ____[Ar] 4s⁰,3d⁵________

 Br^- ____1s²,2s²,2p⁶,3s²,3p⁶,4s²,3d¹⁰4p⁶                                ____[Ar] 4s²,3d¹⁰4p⁶____
3. How many electrons actually exist in the following energy levels of elements on earth?
Hint: See periodic table.
a. n=3, l=2, m₁=3 ____0______             b. n=4 ____32______

c. n=6 ____Depends on periodic table    d. n=7 _____2_____
4. Using Bohr's formula for energy levels, DE=R_hZ²(1/n₁²-1/n₂²), calculate the ionization energy for He⁺ ion in kJ/mole. Note: n₁=1, n₂= ¥ and R_h=2.18x10^-18J
 8.72x10^-18J

5. Make a sketch of the ionization energy vs. atomic number graph for the first three periods.

 See your notes or book

6. Make a sketch of the atomic radius vs. atomic number graph for the first three periods.
  See your notes or book

7. List three ways that the Mendeleeve periodic table differs from the modern periodic table.
 The Mendeleeve periodic table is in order of increasing atomic mass.
There are no transition elements included or f-block elements
The position of several elements would not be the same ie Ar and K would be reversed.
8. Make a sketch of the electron distribution vs. distance from nucleus for chlorine.
 See your book

9. Make a sketch of the electron affinity vs. atomic number for the first three periods.
  See your notes