The Structure Of The Atom

The Structure of the Atom

Concept Description
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.
Isotopes Atoms of the same element with the same atomic number but different mass numbers.
Isotones Atoms of different elements with the same mass number but different atomic numbers.
Isobars Atoms of different elements with the same mass number and the same number of neutrons, but different atomic numbers.
Electron Configuration The arrangement of electrons in shells and subshells around the nucleus of an atom.
Periodic Table A tabular arrangement of elements organized by their atomic number, electron configuration, and recurring chemical properties.
Quantum Numbers A set of four numbers (n, l, ml, and ms) that describe the properties of an electron in an atom.
Electron Shells The main energy levels of an atom, labeled from K to N.
Electron Subshells The subdivisions of electron shells, labeled from 0 to (n-1).
Orbitals The three-dimensional regions where electrons are most likely to be found.
Electron Spin The intrinsic rotation of an electron, which can be either “spin up” or “spin down”.

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