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1-2 Historical Atomic Models and Quantum Mechanical Model of the Atom (17 marks total)
PART A – ATOMIC THEORY (6 marks total: K/U, 4; C, 2)
Compare and contrast the contributions of J. J. Thomson, Ernest Rutherford, and Neils Bohr in a Venn diagram. Remember that the overlapping sections of the
circle are for similarities and the non-overlapping sections are for differences. Use all the words in the word box and their experimental conclusions.
Knowledge: 4 marks (0.5 marks per section x 8, including contributions by Canadian Scientists)
Communication: 2 marks (details, completion of every section and proper use of all words – 2 marks, partially completed and correct – 1 mark, incomplete – 0 mark
**Remember to explain conclusions to any experiments and theories
Ernest Rutherford
Niels Bohr
Contribution by Canadian
Scientists (e.g. Robert J. LeRoy, Ronald
J. Gillespie, Richard F.W. Bader):
Word Box
Plum Pudding
Model
gold foil
experiment
alpha particles
energy levels
J. J. Thomson
1-2 Historical Atomic Models and Quantum Mechanical Model of the Atom
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PART B – CONNECTING BOHR’S ATOMIC MODEL & QUANTUM MECHANICS
Refer to these diagrams as well to answer the following questions.
Emission Spectrum for Hydrogen Gas
Energy and Colours in White Light
PART B - Question 1 (7 marks total: A, 5; C, 2)
a) Label each energy level (shell) by the principal quantum number. (A,2)
b) Complete the following diagram for a hydrogen atom in the ground state. (C, 1)
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c) How would an electron be raised to a higher energy level? (A, 3)
d) Draw an electron of the hydrogen atom in an excited state. (C,1)
PART B - Question 2 (4 marks total)
a) Which diagram shows electron transitions that involve the most energy? __________
(K/U, 1)
b) Explain why this transition involves the most energy based on your understanding of attractive
forces between electrons and protons in the atom AND the colour of light that will be emitted.
(A, 3)
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