The Structure Of The Atom

The Structure of the Atom

ConceptDescription
Atomic Number (Z)The number of protons in the nucleus of an atom.
Mass Number (A)The sum of the number of protons and neutrons in the nucleus of an atom.
IsotopesAtoms of the same element with the same atomic number but different mass numbers.
IsotonesAtoms of different elements with the same mass number but different atomic numbers.
IsobarsAtoms of different elements with the same mass number and the same number of neutrons, but different atomic numbers.
Electron ConfigurationThe arrangement of electrons in shells and subshells around the nucleus of an atom.
Periodic TableA tabular arrangement of elements organized by their atomic number, electron configuration, and recurring chemical properties.
Quantum NumbersA set of four numbers (n, l, ml, and ms) that describe the properties of an electron in an atom.
Electron ShellsThe main energy levels of an atom, labeled from K to N.
Electron SubshellsThe subdivisions of electron shells, labeled from 0 to (n-1).
OrbitalsThe three-dimensional regions where electrons are most likely to be found.
Electron SpinThe intrinsic rotation of an electron, which can be either “spin up” or “spin down”.


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