1 Explain the meaning of various chemical formulas (empirical, molecular, and structural formulas). 2  Calculate weight and mole percentages from a formula.  Derive chemical formulas from a given set of information.
A: Zinc belongs to the family of elements found in Group 12. Some other elements in this family are cadmium and mercury. These three elements are metals, but mercury is a metal that is liquid at room temperature, while zinc and cadmium are solids at room temperature.
The amount of zinc you need daily, or the recommended dietary allowance (RDA), depends on your age and gender. Males age 9 to 13 years old need 8 milligrams of zinc each day. Males age 14 to 18 years old need 11 milligrams each day.