Atoms and Molecules
Modern atomic theory refines Dalton's model and uses proton and neutron counts to describe an atom.
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Modern Atomic Theory and Mass Number
Modern atomic theory refines Dalton's model and uses proton and neutron counts to describe an atom.
Open article →Atomic Mass Unit and Relative Atomic Mass
The carbon-12 scale expresses extremely small atomic masses as relative values.
Open article →Isotopes and Average Atomic Mass
An element's tabulated atomic mass is the abundance-weighted mean of its naturally occurring isotopes.
Open article →Molecules, Atomicity and Molecular Mass
Molecules may contain like or unlike atoms; their formulas show atomicity and relative molecular mass.
Open article →Mole, Particles, Mass and Gas Volume
The mole links microscopic particle counts with measurable mass and gas volume.
Open article →Percentage Composition of a Compound
A formula and relative atomic masses determine each element's mass percentage in a compound.
Open article →Avogadro Law and Vapour Density
Equal gas volumes at the same temperature and pressure contain equal numbers of molecules, connecting gas volume with molecular mass.
Open article →Article access
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