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.