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History of Atomic Structure
Atoms and their parts
History of the atom
Starts not with the ________ of the atom, but the ______ of the atom.
More than ______ years ago, (around ____ BC) Greek philosophers ___________ and ____________ debated the nature of the universe.
historyidea
2000
Aristotle Democritus400
History of the Atom
Aristotle believed that all matter was made of ___ elements: ______, ____, ______ and _______.
4 EarthAir Fire Water
Democritus believed that matter was made of small particles called ______ that cannot be ___________.
atomssubdivided
Early Theories…
Who WON the Debate?Democritus based his theory on ____________, Aristotle based his on __________. Neither of them really did Neither of them really did _____________._____________.
observationphilosophy
__________ argued louder, so he won.Aristotle
Aristotle Democritus
experiments
Who Was Right?
Aristotle’s ideas carried through until the Aristotle’s ideas carried through until the _____________._____________.
A branch of ‘science’ called _________ A branch of ‘science’ called _________ was born.was born.
Alchemists tried to change ______ to Alchemists tried to change ______ to ______.______.
Middle Ages
alchemy
leadgold
Alchemy
Alchemical SymbolsAlchemists were __________ in changing lead to gold – a process called _____________ (_________ one substance into _________.)
unsuccessful
transmutationChanging
another
Who’s Next?In 1661, a chemist named ________ In 1661, a chemist named ________ _______ believed that all matter was _______ believed that all matter was made of simple substances called made of simple substances called _________ that could not be _________ that could not be ____________ or _____________.____________ or _____________.
RobertBoyle
elementsdecomposed broken down
Boyle’s theory was not _________ for Boyle’s theory was not _________ for more than ____ years, since he had no more than ____ years, since he had no way to ______ his theory.way to ______ his theory.
accepted100
prove
Father of Atomic TheoryModern atomic theory was developed in Modern atomic theory was developed in 1809 by an English scientist named _____ 1809 by an English scientist named _____ ________.________.
His theories were based on His theories were based on ___________ and ___________ and ____________.____________.
John Dalton
observations experiments
Dalton’s Atomic Theory1. _______ is made of small particles or 1. _______ is made of small particles or ______.______.
Matter atoms
2. Atoms cannot be ________ or 2. Atoms cannot be ________ or _________._________.
createddestroyed3. All atoms of an element are ________ 3. All atoms of an element are ________ and have the same _____.and have the same _____.
identicalmass
4. Atoms of different elements have 4. Atoms of different elements have different _______. different _______. masses5. ___________ are formed by combining 5. ___________ are formed by combining different elements. different elements.
Compounds
Dalton’s Atomic Theory
Parts of AtomsIn _____, an English physicist named In _____, an English physicist named ______________ did experiments to ______________ did experiments to determine the parts that make up the determine the parts that make up the atom.atom.
1897J.J. Thomson
He created a ________ ray tube: a He created a ________ ray tube: a _______ tube where all the ____ has _______ tube where all the ____ has been pumped out and a limited amount of been pumped out and a limited amount of other ______ is pumped in.other ______ is pumped in.
cathode vacuum air
gases
Thomson’s Experiment
Voltage source
+-
Metal Disks
Passing an electric ________ makes a Passing an electric ________ makes a beam appear to move from the beam appear to move from the ________ to the ________ end________ to the ________ end
Thomson’s ExperimentThomson’s Experiment
Voltage source
+-
current
negative positive
Voltage source
Thomson’s ExperimentThomson’s Experiment
By adding an electric field to the By adding an electric field to the _______ of the tube, he discovered that _______ of the tube, he discovered that the moving pieces were _________.the moving pieces were _________.
+
-
outsidenegative
Thomson’s Model
The negatively charged particles were _________electrons
plum pudding
positive
removed
Said the atom was like Said the atom was like ________________________
A bunch of ________ A bunch of ________ stuff, with the stuff, with the electrons able to be electrons able to be ________.________.
Rutherford’s ExperimentIn _____, an English physicist named In _____, an English physicist named _________________ continued _________________ continued Thomson’s work.Thomson’s work.
1910Ernest Rutherford
He believed the plum pudding model was He believed the plum pudding model was correct, and he wanted to discover the correct, and he wanted to discover the _____ of atoms._____ of atoms.size
Rutherford used thin __________ sheets Rutherford used thin __________ sheets and ___________ material.and ___________ material.
gold foilradioactive
Rutherford’s experiment
The radioactive material released ______ The radioactive material released ______ particles, which connected with a fluorescent particles, which connected with a fluorescent screen and caused it to _____.screen and caused it to _____.
alpha
glow
This is what it looked like:This is what it looked like:
Lead block
Uranium
Gold Foil
Fluorescent Screen
He Expected:
The alpha particles to pass through without ________ _________ very much.changing direction
positiveevenly
Because…Because…
The ________ charges were spread out The ________ charges were spread out _______, and were not enough to stop the _______, and were not enough to stop the positively-charged alpha particles.positively-charged alpha particles.
What he expected
Because
Rutherford thought the mass was evenly distributed in the atom
Rutherford thought the mass was evenly distributed in the atom
What he got
How he explained it:
+
Atoms are mostly Atoms are mostly ______ ______.______ ______.empty space
There is a ______, There is a ______, _______, ________ _______, ________ piece at the center of piece at the center of the atom – called the the atom – called the ________.________.
smalldense positive
nucleus
Positive alpha particles are _________ by Positive alpha particles are _________ by the nucleus if they get close enough…the nucleus if they get close enough…
deflected
Nucleus
+
Modern View of the AtomThere are _____ different types of particles There are _____ different types of particles that make up the atom.that make up the atom.
three
Parts of the AtomProtons Protons have a ________ charge and are have a ________ charge and are located inside the ________.located inside the ________.
positivenucleus
NeutronsNeutrons have a ________ charge and are have a ________ charge and are located inside the ________.located inside the ________.
neutralnucleus
ElectronsElectrons are very _______ particles that are very _______ particles that have a ________ charge and are found have a ________ charge and are found _________ the nucleus._________ the nucleus.
smallnegative
orbiting
The Bohr ModelOur modern model of the atom comes from Our modern model of the atom comes from a Danish chemist named _____ _____, a Danish chemist named _____ _____, who developed it in _____.who developed it in _____.
Niels Bohr
_________ and _________ and _________ are _________ are located in the nucleus.located in the nucleus.
Protonsneutrons
_________ are _________ are located in orbit around located in orbit around the nucleus.the nucleus.
Electrons
1913
Make a TIMELINE!
• Using your notes, make a timeline of Atomic Events in History!
• Use the paper provided and the colored pencils!
• Make it creative, but ACCURATE!
• Include pictures, too!