CH 4 Practice Assessment
1. Complete the following for the element Magnesium:
a. How many protons and electrons does the atom have?
b. What does the atom want to do with its valence electrons?
c. How many protons and electrons does the ion have?
d. Give the symbol and then draw the Lewis dot structure for the atom.
e. Give the symbol and then draw the Lewis dot structure for the ion.
f. What is an atom that has the same number of electrons as the Magnesium ion?
2. Complete the following for the element Oxygen:
a. How many protons and electrons does the atom have?
b. What does the atom want to do with its valence electrons?
c. How many protons and electrons does the ion have?
d. Give the symbol and then draw the Lewis dot structure for the atom.
e. Give the symbol and then draw the Lewis dot structure for the ion.
f. What is an atom that has the same number of electrons as the oxygen ion?
3. What general statement can you make about the properties of a compound and the elements of which
it is composed?
4. List three properties each for water, carbon dioxide and sodium chloride. Then list three properties
each for the elements that compose these compounds. How do the properties compare between the
elements and compounds?
5. Draw the Lewis dots structures for water, carbon dioxide, and C3H8.
6. Determine if the following compounds are ionic or covalent. Explain why you picked your answer
for each compound.
a. lithium chloride, LiCl
b. carbon monoxide, CO
c. cesium oxide, Cs2O
d. sulfur trichloride, SCl3
7. List at least 4 properties of ionic compounds.
8. List at least 4 properties of covalent compounds.
9. Discuss the differences in interparticle forces between ionic and covalent compounds.
10. Draw Lewis Dot Diagrams to model the formation of a compound between lithium and oxygen. What will the
formula of this new compound be?
11. Draw Lewis Dot Diagrams to model the formation of a compound between strontium and chlorine. What will
the formula of this new compound be?