Define the terms : Formula unit mass

Define the term unit .

Define the terms : Molecular mass.

Define the terms: mass number

Define the terms : Mass number

Define the terms mass and weight.

What is meant by the term chemical formula ? Write the chemical formula of calcium oxide. Calculate its formula unit mass. ("Atomic mass of Ca"=40u, O=16u) .

Define the term: Atomic mass number

Define the terms : unit vector and equal vectors.