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8/31/15
Practice:
Exit:
Starter:
Atomic Theory
8/31/15Atomic TheoryApplication:
Fold and Glue notes here when done
Protons Neutrons Electrons Distinct Nucleus
Electron cloud
Bohr
Rutherford
Dalton
Thomson
Cloud model
Connection: Paste Chart Here
Pick an atomic theorist, If they were alive today, what would you ask them?
9 10
At which point can you no longer see the objects with your eyes?Which tools would help magnify things?
Glue paper here when done p 39
EQ: How has scientific research impacted the atomic model?
Agenda 1. Starter2. Practice3. Notes
4. Connection5.Exit
Date Lecture/ Activity/ Lab Page8/28 Syllabus /Notebook Guidelines 1-28/28 Periodic Table/ Formula 3-48/28 Tools/ Measurement 5-68/28 Lab Report/ Investigations 7-88/31 Atomic History/Theorist 9-10
Table of Contents
Application: Atomic Theory
Exit
Year Scientist Theory Diagram
Democritus
Dalton
Thomson
Rutherford
Bohr
Lewis
Shrodinger
Chadwick
Present day
Draw this chart on your paper; will glue afterward
The History of the Atom
The Beginning of
the Atom
Early Models of the Atom
Democritus 460 BC- 370 BC
Universe was made of empty space and tiny bits of stuff Called these tiny bits of stuff atomosAtoms could not be divided
Early Models of the Atom Dalton
Early 1800’s
All elements are composed of indivisible particles. Atoms of the same element are the sameAtoms of different elements are different. Compounds consisted of atoms of different elements combined together
Dalton’s Model of the Atom
He believed the atom was a solid sphere
An analogy to his atom would be…
Early Models of the AtomThomson
1906Plum pudding modelAtom made of a positively charged material with the negatively charged electrons scattered through it.
An American analogy to his atom would be…
Plum Pudding is an English dish sort of like bread pudding with raisins in it.
…Is like…
But we’ll still refer to it as the “Plum Pudding” model in class
Early Models of the Atom Rutherford 1909
Mostly empty spaceSmall, positive nucleus Contained protonsNegative electrons scattered around the outside
Example of Rutherford’s Atom
Early Models of the Atom Bohr 1913
Electrons move in definite orbits around the nucleus
Lewis Dot Structure1916
Recognized that not all electrons in an atom play a role in chemical bondingThe outermost electrons of an atom, called the valence electrons are chemically important.
Erwin Shrodinger
1924 - Austrian physicist; developed the electron cloud model
Electron Cloud Model
Proposed by Erwin Schrodinger
Erwin Shrodinger
His Theory: The exact path of electrons cannot be
predicted.
The region referred to as the electron cloud, is an area where electrons can likely be found.
James Chadwick
1932 - English physicist; discovered neutrons
His Theory: Neutrons have no electrical charge. Neutrons have a mass nearly equal to
the mass of a proton. Unit of measurement for subatomic
particles is the atomic mass unit (amu).
Modern Model of the AtomThe electron cloud
1920’sSometimes called the wave modelSpherical cloud of varying density Varying density shows where an electron is more or less likely to be
Connection:Check which of these applies to
each Theorist
Protons Neutrons Electrons Distinct Nucleus
Electron cloud
Bohr
Rutherford
Dalton
Thomson
Cloud model
Exit
Pick an atomic theorist. If they were alive today, what would you ask them?
8/31/15
Practice:
Exit:
Starter:
Atomic Theory
8/31/15Atomic TheoryApplication:
Fold and Glue notes here when done
Protons Neutrons Electrons Distinct Nucleus
Electron cloud
Bohr
Rutherford
Dalton
Thomson
Cloud model
Connection: Paste Chart Here
Pick an atomic theorist, If they were alive today, what would you ask them?
9 10
At which point can you no longer see the objects with your eyes?Which tools would help magnify things?
Glue paper here when done
EQ: How has scientific research impacted the atomic model?
