Ions and Isotopes: A review

5th period reviewed Ions and Isotopes once again and was able to retake the quiz. Great improvements were made in your grades.

Then, we started the lab that we will complete next class.

8th period will take the quiz tomorrow on Ions and Isotopes and then will work on the lab.

The lab is posted below.

Purpose:       To get experience in graphing techniques and identify the number of valence electrons in different groups of the periodic table.

Materials:      Two sheets of graphing paper, pencils, periodic table.

Procedure:  

1.    Complete the table found in the back of this page using the information from your periodic table.

2.    Obtain a sheet of graph paper from your teacher.

3.    Label the x- axis as atomic number.

4.    Label the y- axis as valence electrons

5.    Plot the information on the back of this paper on your graph.

6.    Remember to give your graph a title.

Data Analysis:

1.                 Using your graph, can you come up with a conclusion on the relationship between atomic number and number of valence electrons? Explain your conclusion?

2.                 Group the elements that had the same number of valence electrons. Looking at your periodic table, do you see a pattern? Explain.

3.                 Using your graph what would you predict the number of valence electrons for Potassium and Bromine to be. Support your answers by referring to your graph.

4.                 Why is it important to know the number of valence electrons?

5.                 During a lab Steve is doing a lab using Iron (Fe) and Chlorine (Cl). He realizes that he doesn’t have chlorine available. What other element could he use in its place and get a similar reaction? Support your answer.

Data Table for Graph Activity #2

Element #	Element Symbol	Element Name	Number of electrons	Number of Valence Electrons
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20