- 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
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