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9 Cards in this Set

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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.