11 terms

PS Atomic Structure

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Atom
the basic unit of matter, made of protons, neutrons, and electrons
Element
a pure substance that cannot be broken down into simpler substances
Nucleus
the center of an atom, contains protons and neutrons
Proton
positively charged particles in the nucleus of atoms
Neutron
neutrally charge particle that has the same mass as a proton and is found in the nucleus of an atom
Electron
negatively charged particles found in the electron cloud
Atomic number
number of protons in the nucleus of an atom
Atomic mass
average mass of an atom (protons + neutrons)
valence electrons
electrons in the outer shell
Energy level
shells where the electrons are found
Electron cloud
region surrounding the nucleus of an atom, where electrons are found