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Timeline of Atomic Models
A Flipped Lesson
Instructions: Watch the video entitled “Timeline of Atomic Models” posted on
the class website and answer the questions below. This assignment MUST be
completed before _________________.
1. Democritus’s Early Ideas about Atoms (2500 years ago):
a) ___________________ and Leucippus developed the idea of “atomos”.
b) What does “atomos” mean? __________________________________________
c) What is one downfall of Democritus’ idea about atoms? (2:24)
…just a
thought
…
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2. John Dalton’s Cannonball/Billiard Ball Model of the Atom (1808):
a) Matter consists of ___________________ atoms. (This means that they cannot be
broken down into any smaller parts.)
b) Atoms arrange in different combinations to make different
____________________.
3. J.J. Thomson’s Plum Pudding Model (1904):
a) What is one main difference between J.J. Thomson’s Plum Pudding Model and
John Dalton’s Cannonball Model? (3:50; 5:07)
______________________________________________________________________________
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b) Draw a labeled diagram of J.J. Thomson’s Plum Pudding Model.
c) Why is the atom “electrically neutral”? (4:45)
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4. Ernest Rutherford’s Nuclear Model of the Atom (1911):
a) What was the name of Ernest Rutherford’s experiment?
______________________________________________________________________________
b) Draw a labeled diagram of Ernest Rutherford’s Nuclear Model.
c) What two things did Ernest Rutherford discover while conducting his experiment?
i) (5:23; 5:44) ___________________________________________________________
________________________________________________________________________
ii) (5:32) ___________________________________________________________
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5. Niels Bohr’s Planetary Model of the Atom (1913)
a) What is one similarity between Niels Bohr’s model of the atom and Rutherford’s
model of the atom?
_______________________________________________________________________________
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b) (6:23) In terms of electrons, how is Niel’s Bohr’s model of the atom different than
Rutherford’s model?
_______________________________________________________________________________
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c) Draw a labeled diagram of Niels Bohr’s Model of the atom.
6. Erwin Schrodinger’s Quantum Mechanical (Electron Cloud) Model of the
Atom (1920s)
a) In terms of electron location, what is one difference between Niels Bohr’s Model
of the atom versus Shrodinger’s model of the atom?
_______________________________________________________________________________
_______________________________________________________________________________
b) Draw a labeled diagram of the Quantum Mechanical Model of the atom,
including the protons and neutrons (8:55).
c) What is the difference between an “orbit” and an “orbital”?
_______________________________________________________________________________
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Summarize:
Subatomic
Particle
Proton
Electron
Neutron
Discovered By
Location in Atom
Charge