a dense, positively charged mass located in the center of the atom.
Nucleus
a positively charged subatomic particle that is found in the nucleus of an atom.
Proton
a negatively charged subatomic particle that is found in the space outside the nucleus.
Electron
a neutral subatomic particle that is found in the nucleus of an atom.
Neutron
the atomic number of an element equals the number of protons in an atom of that element.
Atomic Number
The mass number of an atom is the sum of the protons and neutrons in the nucleus of that atom.
Mass Number
Atoms of a given element that have different number of neutrons and different
Isotopes
The possible energies that electrons in an atom can have.
Energy Levels
A visual model of the most likely locations for the electrons in an atom.
Electron Cloud
A region of space around the nucleus where an electron is likely to be found.
Orbital
Electron ____ - The arrangement of electrons in the orbitals of an atom.
Configuration
A state in which all the electrons in an atoms have the lowest possible energies.
Ground State