Electron Configuration and Periodic
Trends CW3 Ans
1. Determine the larger atom: Ca or Se
Ca
2. Write the valence electron configuration and draw the molecular orbital
diagram for (67) Ho
[Xe] 6s2 4f11
-¯ , -¯ -¯ -¯ -¯ -
-
-
3. Identify the atom with the highest electron affinity: S or Mg
S
4. Explain the vertical trend for atomic size
Increases downward due to increasing energy levels
5. Write the valence electron configuration and draw the molecular orbital
diagram for (31) Ga:
[Ar] 4s2 3d10 4p1
-¯ ,
-¯ -¯ -¯ -¯ -¯ , 6. Identify the atom with the highest ionization energy: I or Y
I
7. Explain what physical characteristic of an atom determines the ionization
energy of that atom and why.
The atomic size determines ionization energy. IE is the energy required to
remove an e- from an atom, the larger the atom the further the e- is from the
nucleus, thus the smaller the IE (less magnetic pull holding the e-)
8. Write the valence electron configuration and draw the molecular orbital
diagram for (106) Sg
[Rn] 7s1 5f14 6d5
- ,
-¯ -¯ -¯ -¯ -¯ -¯ -¯ , -
-
-
-
-
9. Identify the atom with the highest electron affinity: Na, Cs, At, or Cl
Cl
10. Write the valence electron configuration and draw the molecular orbital
diagram for (Te)
[Kr] 5s2 4d10 5p4
-¯ , -¯ -¯ -¯ -¯ -¯ , -¯ - -
11. Identify the atom with the highest ionization energy: Lu, As, Bi, or Sc As
12. Explain the horizontal trend for atomic size
Atomic size increases from right to left because although there are more p+
and e- added they are in the same energy level, keeping the atom from getting
bigger, but the additional p+ and e- increase the magnetic charge making the
atom smaller
13. Write the valence electron configuration and draw the molecular orbital
diagram for (Ca)
[Ar] 4s2
14. Determine the largest atom: Be, Sr, F, or Br
-¯
Sr
15. Write the valence electron configuration and draw the molecular orbital
diagram for (Cu)
- , -¯ -¯ -¯ -¯ -¯
[Ar] 4s1 3d10
16. Explain what physical characteristic of an atom determines the electron
affnity of that atom and why.
The atomic size determines electron affinity. EA is the probability that
an e- will be attracted to an atom, the larger the atom the further the eis from the nucleus, thus the smaller the EA (less magnetic pull
attracting the e-)