#### Transcript of 3.03 Periodic Trends

**3.03 Periodic Trends**

Part I: Atomic Radius Trend Going Across the Periodic Table

Part II: Atomic Radius Trend Going Down a Group

Part III: Analysis and Conclusion

1. Refer to the graph that you created in Part I of this assignment. Describe the general trend or patterns that you observed in the atomic radius as you go across the periodic table. (2 points)

I noticed that as the atomic number increases, the atomic radius decreases. Also, as the atomic number decreases, the atomic radius increases.

2. In Part II of this assignment, you graphed the atomic radius of some elements from group 14 on the periodic table. What is the general trend for atomic radius going down that group? (2 points)

I noticed that as period number increases the atomic radii increases. Also, the atomic radii increases as it goes down the group.

3. What element in Period 5 of the periodic table is a member of Group 14? (1 point)

Tin is in Period 5 and Group 14.

4. 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). (1 point)

I believe Tin has an atomic radius of 145.

5. Tin's actual atomic radius is 140 pm. Use the math equation below to determine the percent error of your estimated value. (2 points)

Percent error = fraction: | actual value minus experimental (estimated value | over actual value × 100

(140-145/140) x 100= 3.57%

6. 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? (2 points)

I believe this is caused by the Y axis, because the axis is so broad and goes by increments of 25.

Atomic Radius Across

X 2 4 6 8 10

Atomic Number

175

150

125

100

75

50

25

Atomic Radius

Y

Period #

Atomic Radius

X 1 2 3 4 5 6 7

Y

175

150

125

100

75

50

25

Atomic Radii Down

**By: Muhammed Hafez**

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