MindMap Gallery Atomic mass and molecular mass
Atomic mass is the sum of the masses of protons and neutrons in the atomic nucleus, usually expressed as the relative atomic mass, a ratio used to compare the masses of different atoms. Molecular mass is the sum of the relative atomic masses of all atoms in a molecule, also known as the relative molecular mass. Molar mass is the mass of a substance expressed in grams per mole, and for a single atom or molecule, its molar mass equals its relative atomic mass or relative molecular mass. The mass number is the total number of protons and neutrons in the atomic nucleus, which approximates the relative atomic mass of the atom (ignoring the mass of electrons). Additionally, molecules composed of different isotopes may have the same molecular mass but differ in physical properties, a phenomenon known as the isotope effect.
Edited at 2025-01-18 09:24:37