Atom: the basic unit of matter
Atom
An atom is the smallest unit of a chemical element that retains its properties. This article explains atomic structure, size, isotopes, bonding, historical development, and practic…
Isotopes
Atoms of the same element with different numbers of neutrons and different masses.
Articles with this tag
Atom: the basic unit of matter
Atom
An atom is the smallest unit of a chemical element that retains its properties. This article explains atomic structure, size, isotopes, bonding, historical development, and practic…
Atomic mass and isotopic mass: definition, units, and relation to mass number
Atomic mass
Defines atomic and isotopic mass, explains units (u and SI), shows how mass number and nucleons relate, and covers isotopes, relative atomic mass and how averages differ from singl…