The valence of aluminum is +3, and the valence of chlorine is –1. the formula for aluminum chloride is
correctly written as
a. clal3.
b. cl3al.
c. alcl3.
d. al3cl.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

distance, luminosity, brightness, radius, chemical composition, and temperature