Download File 8.29.16 atom history

9
8/31/15
Atomic Theory
10
Atomic Theory
8/31/15
EQ: How has scientific research
Application:
Starter:
Fold and Glue notes here when
done
impacted the atomic model?
Glue paper here when
done p 39
Connection: Paste Chart Here
Practice:
At which point can you
no longer see the
objects with your
eyes?
Which tools would help
magnify things?
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?
Agenda
1. Starter
2. Practice
3. Notes
4. Connection
5.Exit
Table of Contents
Date
8/28
8/28
8/28
8/28
8/31
Lecture/ Activity/ Lab
Syllabus /Notebook Guidelines
Periodic Table/ Formula
Tools/ Measurement
Lab Report/ Investigations
Atomic History/Theorist
Page
1-2
3-4
5-6
7-8
9-10
Practice
Powers of 10
Application: Atomic Theory
Year
Scientist
Theory
Diagram
Democritus
Dalton
Thomson
Rutherford
Bohr
Lewis
Shrodinger
Chadwick
Exit
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
atomos
Atoms 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 same
Atoms 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 Atom
Thomson
1906
Plum pudding model
Atom made of a
positively charged
material with the
negatively charged
electrons scattered
through it.
Plum Pudding is an English dish sort of like
bread pudding with raisins in it.
An American analogy to his atom
would be…
…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 space
Small, positive
nucleus
Contained protons
Negative 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 Structure
1916
Recognized that not all electrons in
an atom play a role in chemical
bonding
The 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 Atom
The electron cloud
1920’s
Sometimes called
the wave model
Spherical 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
Bohr
Rutherford
Dalton
Thomson
Cloud
model
Electrons Distinct
Nucleus
Electron
cloud
Exit
Pick an atomic theorist. If
they were alive today, what
would you ask them?
9
8/31/15
Atomic Theory
10
Atomic Theory
8/31/15
EQ: How has scientific research
Application:
Starter:
Fold and Glue notes here when
done
impacted the atomic model?
Glue paper here when
done
Connection: Paste Chart Here
Practice:
At which point can you
no longer see the
objects with your
eyes?
Which tools would help
magnify things?
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?