1. which statement describes the properties of both elements that have just one valence electron and elements that have seven valence electrons?
they are highly reactive.
they are gases at room temperature.
they exist in nature as pure elements.
they easily give up an electron.

2. what are properties of the group of elements on the periodic table that have seven valence electrons?
high reactivity, metallic
high reactivity, nonmetallic
low reactivity, metallic
low reactivity, nonmetallic

3. when oxygen forms an ion, what is its charge?
2+
3+
2-
3-

4. which of the following is a possible formula unit?
li3al
clo2
licl
can

5. what does a lewis structure show that makes it a useful model for a molecule?
all electrons in the atoms
angles between bonds
how electrons are shared
relative sizes of atoms

h
i
h - c - h
i
h

6. the structure looks like the lay out i’ve created above. the lewis structure for methane, ch4 is shown. how many valence electrons does each hydrogen atom in the molecule have?
1
2
4
8

h-h
7. the structure looks like the layout i’ve created above. the lewis structure for a hydrogen molecule, h2, is shown. the line segment in the structure shows that the two atoms
share one valence electron.
share two valence electrons.
have one unshared electron.
have two unshared electrons.

8. what is the molar mass of nano3?
42.0 g/mol
53.0 g/mol
73.0 g/mol
85.0 g/mol