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All terms in this list:

Atom: An Atom is the smallest part of an element that can exist

Nucleus: the dense,positively charged mass located in the center of an atom

subatomic: a term that means smaller than an atom

proton: a positively charged subatomic particle that is found in the space outside the nucleus of an atom

electron: a negatively charged subatomic particle that is found in the space outside the nucleus of an atom

Neutron: a neutal subatomic particle that is found in the nucleus of an atom

atomic number: the number of protons in an atom of an element

element: a pure substance which is made up of only one type of atom

(Niels)Bohr: The man who discovered electron energy levels

Periodic table: a table of the chemical elements arranged in order by atomic number

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