dense, positively charged mass in the center of an atom.
Nucleus
Positively charged subatomic particle found in the nucleus
Proton
Neutral subatomic particle found in the nucleus.
Neutron
number of protons in the nucleus of an atom.
Atomic number
sum of the protons and neutrons in the nucleus of an atom.
Mass number
atoms of the same element having different numbers of neutrons.
Isotope
possible energies that electrons in an atom can have.
Energy levels
Term for an atom whose electrons have the lowest possible energies
Ground state
Region of space where an electron is likely to be found.
Orbital
Visual model of the most likely locations for electrons in an atom.
Electron cloud
atoms that have the ability to spontaneously and continuously decay.
Radioactive
Arrangement of atoms by increasing atomic number.
Periodic table
Groups of atoms.
Molecule
Substances that cannot be broken down unto any other substances.
Element
Pure substances that are produced when elements combine.
Compound
An atom or molecule which has lost or gained one or more electrons, giving it a positive or negative electrical charge.
Ions
The science of the composition, structure, properties, and reactions of matter, especially of atomic and molecular systems.
Chemistry
Breaking down or breaking apart.
Decay
negatively charged subatomic particle which orbits outside of the nucleus.
Electron
The smallest piece of an element that still represents that element.
Atom

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