PERIODIC TRENDS IN IONIZATION ENERGY
In this activity, you will prepare a graph of ionization energy as a function of atomic number. Using this graph, you will investigate the trends in ionization energy within a group and a period of the Periodic Table.
PROCEDURE:
1. Label the horizontal axis atomic number and the vertical axis
ionization energy. Set up appropriate scales for the data provided
below. (Click
here to learn how to set up appropriate scales for your data.) Plot the data and join the points with a
solid line. Do not label each data point.
|
1 |
H |
1310 |
|
15 |
P |
1060 |
|
29 |
Cu |
745 |
|
42 |
Mo |
693 |
|
2 |
He |
2370 |
|
16 |
S |
999 |
|
30 |
Zn |
906 |
|
43 |
Tc |
- |
|
3 |
Li |
520 |
|
17 |
Cl |
1260 |
|
31 |
Ga |
579 |
|
44 |
Ru |
724 |
|
4 |
Be |
899 |
|
18 |
Ar |
1520 |
|
32 |
Ge |
785 |
|
45 |
Rh |
743 |
|
5 |
B |
800 |
|
19 |
K |
419 |
|
33 |
As |
965 |
|
46 |
Pd |
804 |
|
6 |
C |
1090 |
|
20 |
Ca |
590 |
|
34 |
Se |
941 |
|
47 |
Ag |
731 |
|
7 |
N |
1400 |
|
21 |
Sc |
633 |
|
35 |
Br |
1140 |
|
48 |
Cd |
868 |
|
8 |
O |
1310 |
|
22 |
Ti |
659 |
|
36 |
Kr |
1350 |
|
49 |
In |
558 |
|
9 |
F |
1680 |
|
23 |
V |
650 |
|
37 |
Rb |
403 |
|
50 |
Sn |
708 |
|
10 |
Ne |
2080 |
|
24 |
Cr |
652 |
|
38 |
Sr |
549 |
|
51 |
Sb |
834 |
|
11 |
Na |
496 |
|
25 |
Mn |
717 |
|
39 |
Y |
637 |
|
52 |
Te |
869 |
|
12 |
Mg |
738 |
|
26 |
Fe |
762 |
|
40 |
Zr |
671 |
|
53 |
I |
1007 |
|
13 |
Al |
577 |
|
27 |
Co |
758 |
|
41 |
Nb |
653 |
|
54 |
Xe |
1170 |
|
14 |
Si |
786 |
|
28 |
Ni |
737 |
|
|
|
|
|
|
|
|
Link to paper to
graph this data
2. Divide the graph into several sections by drawing vertical lines through the points that represent the noble gases.
ANALYSIS:
1. Create two lists:
(A) the symbols of the elements with the lowest ionization
energy in each section
(B) the symbols of the elements with the highest ionization
energy in each section
CONCLUSIONS:
Within a period, as atomic number increases, ionization energy generally ____________________ because...
Exceptions to this trend occur at groups ____ and ____. This is probably due to ...
Within a group, as atomic number increases, ionization energy ____________________ because...