### Atomic Radius & Periodic Table – Chemistry

The key terms of this chemistry chapter include Atomic Radius trend, Periodic Table, Atomic Number, Electrons, Elements, atomic radius of Tin (Sn), Chemistry Exam.

**Part 1**

**Atomic Radius Trend Going Across The Periodic Table**

**Part 2**

**Atomic Radius Trend Going Down A Group **

**Analysis And Conclusion**

Describe the general trend or patterns that you observed in the atomic radius as you go across the periodic table.

**When the atomic radius is larger when the atomic number is smaller.**

What is the general trend for atomic radius going down that group?

**There was a recognizable trend for some of the elements in graph two, the atomic radius is bigger when the atomic number in the same column is also bigger.**

What element in Period 5 of the periodic table is a member of Group 14?

**Tin is in both period 5 and group 14.**

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 2 to interpolate, or estimate, atomic radius of Tin (Sn).

**By estimating the atomic radius of Tin (Sn) it would come out to be an atomic radius of 150.**

Tin’s actual atomic radius is 140 pm. Use the math equation below to determine the percent error of your estimated value.

**After using the equation provided above my answer was slightly over 7% my estimated number.**

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?

**I don’t think this was precise because of my graph design possibly, it went from period number 4 to 6, which left a lot of room for error in estimation. The properties of atoms range differently, and their shells will differ and this will affect the electron cloud.**