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Development of the Atomic Theory
Introduction:
If you were asked to draw the structure of an atom, what would
you draw? Throughout history scientists have accepted five atomic
models. Our perception of the atom has changed from the early
Greek model because of evidence that has been gathered through
scientific experiments. As more evidence was gathered old models
were discarded or improved upon. Your goal is to trace the atomic
theory through history.
Task:
1. You and your partner will search the Internet sources provided to learn
more about the scientists and discoveries that have led to our current
knowledge of the structure of the atom.
2. Using your research, construct a timeline within a Power Point
presentation as a visual representation of the development of modern atomic
theory.
3. Describe and find a representative image for the five historical models
of the atom - Democritus, Thomson's Plum Pudding, Rutherford, Bohr, and
Modern Electron Cloud.
Process:
You will be assigned 1 partner.
Read the entire Web Quest.
Read your textbook Chapter 11 Section 1.
Use any of the following Web sites to get information about listed scientists
and their discoveries that were not in your text. You may search other Web
sites on your own or use library resources.
Include the following on your timeline:
1. Names of all scientists mentioned in VBO 8.2.1.
8.2.1 - Describe the historical development of the concept of the atom and the
periodic table including the contributions of Democritus, Dalton, Thomson,
Rutherford, Bohr, Mendeleev, and Moseley.
2. The year(s) of the scientist’s discovery and/or contribution.
3. In 1-2 sentences tell the importance of the discovery that relates to
the structure of the atom or the periodic table (some of these people
did many types of research).
4. Include the five historical models of the atom – Democritus,
Thomson's Plum Pudding, Rutherford, Bohr, Modern Electron Could
model.
A timeline is in chronological order – earliest
time to latest time.
Resources:
History
Atomic Structure
Timeline: http://www.watertown.k12.wi.us/HS/Staff/Buescher/atomtime.as
p (Click cancel if asked for a password)
Atom - The Incredible
World: http://library.thinkquest.org/19662/low/eng/index.html
Atomic Structure Table of
Contents: http://www.dbhs.wvusd.k12.ca.us/webdocs/AtomicStructure/Ato
micStructure.html
List of Historical Contributors and Developments Related to Atomic
Theory: http://www.hometown.aol.com/eilatlog/taxons/history.html
Encarta Atom: http://encarta.msn.com/encyclopedia_761567432_9/Atom.html
The History of Atomic
Theory: http://www.lancs.ac.uk/ug/cooked1/index.htm (info about
Thomson's Plum Pudding under Modern Atomic Theory section)
History of the Atom:
http://www.winneconne.k12.wi.us/middle_school/7th%20Grade/LENZ/Mr.%
20Lenz's%20Page.htm (Click cancel if asked for a password. Go to Chemistry
link at bottom left, then to History of Atomic Theory at top left on next
page.)
Models
The Atom - Info and Democritus, Plum Pudding, Rutherford Models:
http://www.lbl.gov/abc/wallchart/chapters/02/1.html
Modern Model of the Atom: http://www.aplus.net/tom/mercer/edsc651physci/modelatom.htm
Plum Pudding and Bohr Model: http://wwwoutreach.phy.cam.ac.uk/camphy/nucleus/nucleus1
History of the atom - Info and Plum Pudding, Rutherford, Bohr models:
http://www.broadeducation.com/htmlDemos/AbsorbChem/HistoryAtom/pag
e.htm
Mendeleev:
http://en.wikipedia.org/wiki/Mendeleev
http://www.aip.org/history/curie/periodic.htm
http://www.chemistry.co.nz/mendeleev.htm
Moseley
http://www.corrosion-doctors.org/Periodic/Periodic-Moseley.htm
http://www.chemistry.co.nz/henry_moseley.htm
http://mooni.fccj.org/%7Eethall/period/period.htm
Evaluation:
Category
Dates/Scientis
ts
9x-max 45pt
Contribution
to Atomic
Theory
6x-max 30 pt
5
4
3
2
Most
Few
All scientists
scientists Some scientists scientists
listed Dates are
listed or 2 listed or 3 out of listed or 4
correct and in
out of
order.
out of
order.
order.
order.
27 pt
45pt
36 pt
18 pt
All
contributions
listed and apply
to Atomic
Theory.
30 pt
2-3 errors 4-6 errors contributio contributions n
ns not
ot listed or do
listed or do
not apply to
not apply to Atomic Theory.
Atomic
18 pt
Theory.
7-9 errors contributio
ns not
listed or do
not apply to
Atomic
Theory.
Models of
Atoms
4x-max 20 pt
Attractiveness
1x-max 5 pt
24 pt
12 pt
4 models
All 5 models
shown
shown correctly
3 models shown
correctly
and
correctly and
and
correctly name
correctly named.
correctly
d.
named.
12 pt
20 pt
16 pt
Timeline
and models
Timeline and are
Timeline and
models
attractive in models
are exceptional terms of
are acceptably
ly attractive in layout,
attractive in
terms of layout, neatness, terms of layout,
neatness, and and use of neatness, and
use of color.
use of color.
color.
2 models
shown
correctly
and
correctly
named.
5 pt
8 pt
Timeline
and models
are messy
with no use
of color.
They are
not
attractive.
3 pt
4 pt
2 pt
Back to top
Conclusion:
This assignment is based on 100 points. You can earn extra points by
making models to display in the classroom or making a large timeline
with pictures of the scientists. See the teacher for details.
This assignment will allow you to observe how the Atomic Theory
started as a philosophical idea and through quantitative
experimentation, has been developed to include the current
Electron Cloud Model. You will see that as scientists discovered
more and more information they discarded parts of older theories
to design an atomic model that provided a more accurate
representation of the atom. It is important for scientists to
challenge current theories and modify them as more knowledge
becomes available. Your research provides you with a historical
perspective of our knowledge of the atom's structure.