Atomic Structure

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nucleus
dense, positively charged mass in the center of an atom.
proton
Positively charged subatomic particle found in the nucleus.
neutron
Neutral subatomic particle found in the nucleus.
atomic number
number of protons in the nucleus of an atom.
mass number
sum of the protons and neutrons in the nucleus of an atom.
isotope
atoms of the same element having different numbers of neutrons.
energy levels
possible energies that electrons in an atom can have.
ground state
Term for an atom whose electrons have the lowest possible energies
orbital
Region of space where an electron is likely to be found.
electron cloud
Visual model of the most likely locations for electrons in an atom.
electron configuration
Arrangement of elections in the orbitals of and atom.
radioactive
atoms that have the ability to spontaneously and continuously decay.
periodic table
Arrangement of atoms by increasing atomic number.
molecule
Groups of atoms.
element
Substances that cannot be broken down unto any other substances.
compound
Pure substances that are produced when elements combine.
ions
An atom or molecule which has lost or gained one or more electrons, giving it a positive or negative electrical charge.
chemistry
The science of the composition, structure, properties, and reactions of matter, especially of atomic and molecular systems.
decay
Breaking down or breaking apart.
electron
negatively charged subatomic particle which orbits outside of the nucleus.
Categories: Atomic Physics