Structure of an Atom Nucleus: Nucleus:Proton Nucleus:Proton+ Nucleus:Proton+ Neutron Nucleus:Proton+ Neutron No charge Structure of an Atom Nucleus:Proton+ Neutron No charge Outside the Nucleus: Structure of an Atom Nucleus:Proton+ Neutron No charge Outside the Nucleus: Electron Structure of an Atom Nucleus:Proton+ Neutron No charge Outside the Nucleus: Electron - Structure of an Atom Atomic Number - Structure of an Atom Atomic Number - The number of Protons in the nucleus Structure of an Atom Atomic Mass - Structure of an Atom Atomic Mass - The number of Protons plus the number of Neutrons in the nucleus Structure of an Atom Note: Note: On the Periodic Table Structure of an Atom Note: The number of Protons EQUALS the number Electrons in the atom On the Periodic Table Structure of an Atom Note: On the Periodic Table Structure of an Atom Note: ALL Elements on the Periodic Table are NEUTRAL On the Periodic Table Structure of an Atom Note: On the Periodic Table Structure of an Atom Note: The mass of an Element may change, but the Protons DO NOT! On the Periodic Table Structure of an Atom Question: Question: If the Protons stay the same, what is different to make the Mass change? Structure of an Atom Answer: Answer: Neutrons Role of Electrons Tiny Particles, Big Spaces Role of Electrons Tiny Particles, Big Spaces Valence Electrons: Role of Electrons Tiny Particles, Big Spaces Valence Electrons: Electrons farthest away from the Nucleus Role of Electrons Tiny Particles, Big Spaces Valence Electrons: Involved in bonding # of Valence Electrons Models of Atoms Dalton Model Models of Atoms Dalton Model Models of Atoms John Dalton Dalton Model Models of Atoms John Dalton Great Britain Dalton Model Models of Atoms John Dalton Great Britain 1808 Dalton Model 1808 Models of Atoms Dalton Model Each Element is made of small atoms. Models of Atoms 1808 Dalton Model Each Element is made of small atoms. Tiny, solid balls 1808 Models of Atoms Thomson Model Models of Atoms Thomson Model J. J. Thomson Models of Atoms Thomson Model J. J. Thomson Great Britain Models of Atoms Thomson Model J. J. Thomson Great Britain 1897 Models of Atoms Thomson Model 1897 Models of Atoms Thomson Model Plum Pudding Models of Atoms Thomson Model Plum Pudding - positively charge sphere with electrons inside 1897 Models of Atoms Nagaoka Model Models of Atoms Nagaoka Model Hantaro Nagaoka Models of Atoms Nagaoka Model Hantaro Nagaoka Japan Models of Atoms Nagaoka Model Hantaro Nagaoka Japan 1904 Models of Atoms Nagaoka Model 1904 Models of Atoms Nagaoka Model Large Sphere in center with positive charge, 1904 Models of Atoms Nagaoka Model Large Sphere in center with positive charge, electrons outside 1904 Models of Atoms Rutherford Model Models of Atoms Rutherford Model Ernest Rutherford Models of Atoms Rutherford Model Ernest Rutherford Great Britain Models of Atoms Rutherford Model Ernest Rutherford Great Britain 1911 Models of Atoms Rutherford Model 1911 Models of Atoms Rutherford Model Atom is mostly Empty Space 1911 Models of Atoms Rutherford Model Atom is mostly Empty Space Electrons orbit randomly around the nucleus 1911 Gold Foil Experiment Models of Atoms Bohr Model Models of Atoms Bohr Model Niels Bohr Models of Atoms Bohr Model Niels Bohr Denmark Models of Atoms Bohr Model Niels Bohr Denmark 1913 Models of Atoms Bohr Model 1913 Models of Atoms Bohr Model Electrons are not Random 1913 Models of Atoms Bohr Model Electrons are not Random Electrons in specific layers 1913 Models of Atoms Bohr Model Electrons are not Random Electrons in specific layers Give energy as they move 1913 Models of Atoms Chadwick Model Models of Atoms Chadwick Model James Chadwick Models of Atoms Chadwick Model James Chadwick Great Britain Models of Atoms Chadwick Model James Chadwick Great Britain 1932 Models of Atoms Chadwick Model 1932 Models of Atoms Chadwick Model Neutron has same mass as the Proton but no electrical charge 1932 Models of Atoms Modern Model Models of Atoms Modern Model NOW Models of Atoms Modern Model Electrons form a negatively charged Cloud NOW Models of Atoms Modern Model NOW Electrons form a negatively charged Cloud Models of Atoms Modern Model NOW Electron Cloud Theory I wont ask if there are more notes!