This document discusses two chemical compounds - sodium fluoride and phosphorus trichloride. Sodium fluoride is an ionic compound that is a white powder soluble in water. It has various uses such as in toothpaste for preventing tooth decay, in water treatment, and for industrial purposes. Phosphorus trichloride is a molecular compound used to produce many agricultural products like surfactants and flame retardants. The document briefly explains chemical bonding and the role of valence electrons in forming ionic and molecular compounds.