get to know one of the greatest chemist of the 20th century

1. Ernest Rutherford
1st Baron Rutherford of Nelson
The father of Nuclear Physics

2.  August 30,
…Rutherford born on
1871and he died on October
19, 1937 in Brightwater,
New Zealand.

3.  He conducted his experiment on………
1911by Hans Geiger and Ernest Marsden at the
suggestion of Ernest Rutherford. Geiger and
Marsden expected to find that most of the alpha
particles travel to straight trough the foil with
little deviation, with a remainder being deviated
by a percent or two.
When did he conduct his experiment?

4. WHAT WAS HE TRYING TO PROVE W/ HIS EXPERIMENT?
 Rutherford proving about the existence
of …….. Neutrons. It was named by
James Chadwick.
 Which could somehow compensate for the
repelling effect of the positive charges of
protons by causing an attractive “nuclear
force” and thus keep the nuclei from flying
apart from repulsion between protons.

5. Summarize his experiment (what he did and what he discovered)
Gold Foil Experiment

6.  The gold foil experiment consisted of a series of
tests in which positively charged alpha particles
(helium nuclei) were fired at a very thin sheet of
gold foil. If Thomson's Plum Pudding model was to
be accurate, the big alpha particles should have
passed through the gold foil with only a few minor
deflections. This is because the alpha particles
are heavy and the charge in the "plum pudding
model" is widely spread.

7.  In detail, a beam of alpha particles, generated by
the radioactive decay of radon, was directed normally
onto a sheet of very thin gold foil in an evacuated
chamber. A zinc sulfide screen at the focus of a
microscope was used as a detector; the screen and
microscope could be swivelled around the foil to observe
particles deflected at any given angle. Under the
prevailing plum pudding model, the alpha particles should
all have been deflected by, at most, a few degrees;
measuring the pattern of scattered particles was
expected to provide information about the distribution
of charge within the atom.

8. Why was he surprised by his
experimental results?
• Bec. On his experiments, many of the alpha
particles did pass through as expected, many
others were deflected at small angles while others
were reflected back to the alpha source.

9. How did his results fit w/
Thomson’s view of the atom?
 Since none of Thomson's negative
"corpuscles" (i.e. electrons) contained
enough charge or mass to deflect alphas
strongly, nor did the diffuse positive "pudding"
or cloudlike positive charge, in which the
electrons were embedded in the plum
pudding model. Instead, Rutherford
suggested that a large amount of the atom's
charge and mass is instead concentrated into
a very physically small (as compared with the
size of the atom) region, giving it a very high
electric field. Outside of this "central charge"
(later termed the nucleus), he proposed that
the atom was mostly empty space.

10. a number of tiny electrons circled the nucleus like the particles then
hypothesized to make up the ring around Saturn. By implication,
Rutherford's concentration of most of the atom's mass into a very small core,
made some type of planetary model an even more likely metaphor than
before, as such a core would contain most of the atom's mass, in an analogy
to the Sun containing most of the solar system's mass.

11.  His beliefs
were accepted until one scientist made an
experiment regarding Rutherford’s experiment. He is Niels
Bohr.

12.  www.micro.magnet.fsu.edu/electromag/java
/rutherford
 en.wikipedia.org/wiki/Ernest_Rutherford
 http://www.thocp.net/biographies/rutherfor
d_ernest.html
 www.christchurchcitylibraries.com/kids/.../
ernest.asp

13. 5 Things you don’t know
about…………
Ernest Rutherford

14. #5
Did you know that………
The house where Rutherford was born in
Brightwater was demolished in 1921?..
After years of neglect, the Rutherford Birthplace
Project committee was formed to transform the
site of original house into a national memorial to
Lord Rutherford. The Rutherford Origin, with
information displays about Rutherford in a garden
setting, was opened on December 6, 1991.

15. #4
Did you know that……….
Rutherford worked on acoustic methods of
detecting submarines?...... That was when
he back in England, during the following
years of the First World War.

16. #3
Did you know that………..
After graduating, he taught for a few
weeks at Christchurch Boys’ High
School……. but was not particularly
successful as a teacher.

17. #2
Did you know that………
Rutherford's call for New Zealand
institute for scientific research resulted
in the establishment of the Department
of Scientific and Industrial Research
in 1926.

18. #1
Did you know that…….
Ernest Rutherford was a fiercly ANTI –
NAZI?....
Nazi was an organization that becomes an empire
lately. When german refugees migrated in 1933,
he served as president of the Academic
Assistance Council, established to help them.

19. Questions
1. What is his country of Origin?
2-3. Complete the Sentence
Rutherford was the father of ______and 1st
Baron Rutherford of ______.
4. He conducted his experiment on___.
5. What happened to the house in 1921 where
Rutherford was born?
6. Who proved that Neutrons exist?

20. 7. (Yes or No) Did Rutherford’s beliefs
were accepted at that time?
8. (True or False) Rutherford experiments
gravity?
9. (True or False) Rutherford was born on
Brightwater, New Sealamb.
10. Rutherford anti’s_______.

21. KEY TO CORRECTIONS
1. New Zealand
2-3. Nuclear Physics & Nelson
4. 1911
5. Demolished
6. James Chadwick
7. Yes
8. False
9. False
10.Nazi