Name: __________________________________________________ Period: ________ Date: _________________
The 2-8-8 Rule
Part 1: Explain the rule in the box below. Then, use it to draw electron configurations for four elements.
According to the 2-8-8 Rule…
Element: _________________________
Element: _________________________
P=
P=
N=
N=
Element: _________________________
Element: _________________________
P=
P=
N=
N=
OVER 
Part 2: Use your knowledge of atomic structure to answer the following questions. You will need to
refer to the periodic table.
1) How many neutrons are in Iron?
2) How many electrons are in Barium?
3) How many protons are in Iodine?
4) What is the atomic number for lead?
5) What is the atomic mass from Uranium?
6) How many valence electrons does Francium have?
7) How many energy levels (shells) does Argon have?
8) How many valence electrons does Silicon have?
9) How many energy levels does Beryllium have?
10) What element is Lithium most similar to?
11) What element is Oxygen most similar to?
12) Name two elements that have a full outer shell of electrons:
13) Which elements are likely to bond with another atom?
14) Elements in Group #______ are called the _______ gases. Explain in the space below why
these elements don’t really bond with other atoms: