Question

Define = relative density, atomic mass, molecular mass , atom,molecules,ions

Answer 1

atom= An atom is the smallest particle of an element that can take part in a chemical reaction
molecule=a molecule is the smallest particle of a substance which has the property of that substance and can exist in the free state
molecular mass ..the m.m of a substance is equal to the sum of atomic masses of all the atoms present in a molecule of that substance.
atomic mass..the atomic mass is equal to 1/12th of mass of C*12 atom

Answer 2

relative density is the density of an object or fluid in comparison to the density of water.         relative density = density of x/ density of water.