Chemical quantities

number of protons found in the nucleus of an atom

rest mass of an atom in its ground state

number of heavy particles in the atomic nucleus

mass per amount of substance

extensive physical property

volume per amount of substance

measure of the concentration of a solute in a solution, or of any chemical species, in terms of amount of substance in a given volume; most commonly expressed in units of moles of solute per litre of solution

dimensionless physical quantity: ratio of the average mass of atoms of an element to one unified atomic mass unit

property (of a system or substance) that is intensive or is extensive

relative atomic mass, in samples by standard, as published by IUPAC (CIAAW)