Part I: Atomic Radius Trend Going Across the Periodic Table
| Element | Atomic Number | Atomic Radius (pm) |
|---|---|---|
| Lithium | 3 |
152
|
| Beryllium | 4 |
113
|
| Boron | 5 |
88
|
| Carbon | 6 |
77
|
| Nitrogen | 7 |
70
|
| Oxygen | 8 |
66
|
| Fluorine | 9 |
64
|
| Neon | 10 |
58
|
Part II: Atomic Radius Trend Going Down a Group
| Element | Period Number on the periodic table | Atomic Radius (pm) |
|---|---|---|
| Carbon |
2
|
77
|
| Silicon |
3
|
117
|
| Germanium |
4
|
122
|
| Lead |
6
|
175
|
Part III: Analysis and Conclusion
Describe the general trend or patterns that you observed in the atomic radius as you go across the periodic table.
- I observe that as the atomic number increases, the atomic radius decreases.
What is the general trend for atomic radius going down the periodic table?
- As the period number increase, so does the atomic radius.
What element in Period 5 of the periodic table is a member of Group 14?
- Tin (Sn)
The word interpolate means to use a given line graph to find unknown points between the plotted points of the graph. Use your line graph from Part II to interpolate, or estimate, atomic radius of Tin (Sn).
- About 150
Tin's actual atomic radius is 140 pm. Use the math equation below to determine the percent error of your estimated value.
- 150 - 140 x 100 = 7%
140
The atomic radius you estimated from your graph is most likely not exactly the same as the true atomic radius of Tin. There is a small percent error. What do you think caused this error?
- Maybe a wrong calculation.
