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Atoms

Atom The building blocks of matter; make up EVERYTHING
Electron Negatively charged, located outside the nucleus, does not contribute to the atom’s mass. In a neutral atom the number of protons and electrons are equal.
Proton Positively charged, located inside the nucleus included in the atom’s mass. Atomic Number = # of protons, determines the element’s identity
Neutron No electrical charge, located inside the nucleus, included in the atom’s mass
Atomic Mass Number Protons + Neutrons
Periodic Table A table consisting of all the different atoms in the world.
Atomic number The number of protons in an atom.
The electrons on the outermost shell Valence Electrons
Created by: jspielman
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