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Atomic Number
Number of protons in an atom
Atoms
The particles that make up all materials; the smallest part of an element that can take part in a chemical reaction.
Electron Configuration
Arrangement of electrons in electron shells.
Electron Shells
Also known as energy levels, the regions surrounding the nucleus, where the electrons are found.
Element
A substance composed of atoms with the same atomic number; 118 are known to exist.
Energy levels
Also known as electron shells, the regions surrounding the nucleus where electrons may be found.
Ground State
The lowest energy arrangement of an atom's electrons in energy levels (shells)
Indirect Evidence
Evidence that does not involve direct observation.
Nulcleus
Heavy core at the centre of the atom,made of protons, and neutrons.
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