Homework: Names and Formulas
of Molecular Compounds
Follow the instructions given for each section of this
worksheet. You will need your periodic table, a quiet
place to work, and your wits to complete this homework.
Also, you may find it helpful to refer back to the
of the activity you did prior to this homework.
Answer the following questions using complete
What is the difference between a
compound and an element?
What are the characteristics of
metallic elements? Where are they found in the periodic
Describe the properties of
non-metals. Where are they found in the periodic table?
What kinds of elements are
involved in most molecular compounds?
What is a diatomic molecule?
Is it necessary for a diatomic
molecule to be made of two of the same atom? Explain.
Which elements exist in pure
form as diatomic molecules? (Remember, you must memorize
What are some compounds that are
Describe the behavior of
electrons in a covalent bond between atoms. How do the
electrons keep the atoms bound together?
What are the physical
characteristics or properties which differentiate ionic
compounds from molecular compounds?
Compare and contrast the types
of elements found in the chemical formulas of molecular
compounds and ionic compounds.
In your own words, write down the correct procedure for
writing a name for a molecular compound from its formula.
Enrich your procedure with examples such as how to name
these compounds: NO,
BrI, BrI5, P4O10.
For each of the following atoms write down the number of
valence e-s. Also, draw the Lewis dot diagram.
For example, Magnesium (Mg)
has two valence electrons and has a Lewis diagram that
looks like this: Mg:
In your own words explain how to find the correct
number of valence electrons from an element’s
position in the periodic table.