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matts science 3

QuestionAnswer
Dmitri Medeleev created the first valid periodic table of the elements in 1869.
Atom are the basic building blocks of matter that make up everyday objects
Proton + In the nucleus of the atom
Neutron doesnt have a charge,In the nucleus of the atom
Electron - are found around the nucleus
Atomic mass The mass of an atom, usually expressed in atomic mass units.
Atomic # The number of protons in an atomic nucleus
Created by: mktmac
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