BOHR-RUTHERFORD DIAGRAMS and the PERIODIC TABLE

Today we will be looking at the worksheet that you completed yesterday night for homework. (course kit pg 37).

Is there any specific thing that you can notice about the arrangement of the elements, and their electron configuration (shells) that looks similar? They should! If you look at the very first coloumn of the periodic table you will note that each element has only one electron in it's outer most shell. This coloumn of the periodic table is called the, "Alkaline Metals". The second column, as you can see by the BOHR-RUTHERFORD diagrams that each element in this column has 2 electrons in the outer shell. These elements are called the, "Alkaline Earth Metals".

Now, jump across to the 17th column of the periodic table and take a look at the elements configuration. What do you see? Yes that's right! There are 7 electrons in the last shell of each element. These are called, " Halogen Gases". Finally the last column, 18. This column shows that the elements have 8 electrons in the outer orbit, and the shell is full, so it is called a stable octet. The Family name of this column is the, " Knoble Gas" family.

HOMEWORK:
Using your course kits and the overhead notes in class today please complete pg 25 to 31
Make sure to read Mendeleev and Mosley. Chemical families colour and complete charts.