13.
Some elements are solids, liquids, or gases at room temperature. Outline the
symbols blue for elements that are liquids at room temperature, red for elements
that are gases at room temperature, and don’t do anything for elements that are
solid at room temperature.
14.
Valence electrons: electrons that are in the outer most shell. Each family
has the same amount of valence electrons. Write the number of valence electrons
at the top of each family.