Practice Problems!
Use your copy of the periodic table to determine the number of Protons, Neutrons,
and Electrons in each of the following atoms
1. Lithium
2 Iron
3. Arsenic
4. Mercury
P _______
P _______
P ______
P ______
N ______
N ______
N _____
N _____
E _______
E _______
E ______
E ______
Look at the chemical formulas listed below. Using your periodic table and your
knowledge of oxidation numbers, list the elements present and the oxidation
numbers for each. Identify the sum of the oxidation numbers for the compound
and identify if the compound would be stable (happy) or unstable (unhappy).
Chemical Formula
(Compound)
Oxidation Numbers for
each element
Sum of Oxidation
Numbers
Happy or Unhappy?
CaO
LiI
Al2S3
Using your periodic table, draw the electron shell model (Bohr model) for each of
the elements listed. (Use a separate piece of paper) Also, write the name of ONE
element that could combine with that atom to form a happy, stable compound.
(Hint: Remember your oxidation numbers)
-
Beryllium
Phosphorus
Carbon
Potassium