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Physical Science - Unit 2 Vocabulary

atom smallest particle of an element that still has the properties of the element
element substance is which the atoms are the same, chemical
periodic table organized table of elements
Mendeleev developed the periodic table of elements in the late 1800's
Dalton developed the atomic theory
nucleus center of the atom, positively charged
proton positively charged particle in an atom (p)
electron negatively charged particle in an atom (e-)
neutron part of an atom with no charge, neutral (n)
electron cloud around the nucleus where are electrons are found
atomic number number of protons in an atom
atomic mass number of protons and neutrons in an atom
isotope same element but has a different mass because it has a different number of neutrons
electron dot diagram shows number of electrons in the outer level of an atom
valence electrons electrons in the outer shell of an atom
Created by: mrsmcdonough