Boron is an element and contains only atoms of Boron.
Boron trichloride is the inorganic compound with the formula BCl₃.
Boron Sulfide is a chemical compound with the formula B₂S₃. B = Boron S = Sulfur Its molar mass is 117.8 g/mol.
BCl3 is the formula for Boron Chloride. As a matter of interest it does not obey the octet rule. It is also called a Lewis Acid.
The formula mass for boron nitrate is 197 grams per mole.