Download Part I: Vocabulary Matching Part II: Identification

C.6A: Atomic Theory
Atomic Structure and Nuclear Chemistry
Part I: Vocabulary Matching
Match the terms on the right to the correct definition.
1. _______ atomic theory
A.  Specific regions around the nucleus of
an atom in which electrons travel
2. _______ electron orbital
B. 
3. _______ nucleus
C.  Conceptual model of the atom in which
a small, positively-charged nucleus is
surrounded by negatively-charged
electrons
4. _______ nuclear atom
Part II: Identification
Dense, positively-charged region in the
center of an atom
D.  Theory that all matter is composed of
tiny indivisible particles known as atoms
Use the clues provided to fill in the blanks.
Word Bank
Ernest Rutherford
Niels Bohr
J.J. Thomson
John Dalton
1.  _________________________ first described the atom as having a central positivelycharged nucleus surrounded by orbiting electrons.
2.  In the late 1800s, ___________________ discovered electrons through his explorations
on the properties of cathode rays.
3.  In the early 1800s, the chemist who proposed the first theory relating chemical changes
to events at the atomic level was __________________________.
4.  ___________________ developed the modern model of an atom which expanded on
Rutherford’s description by explaining that electrons travel only in certain successively
larger orbits.
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C.6A: Atomic Theory
Atomic Structure and Nuclear Chemistry
Part III: Open-Ended Response
Answer the questions below. Use additional paper if needed.
1.  Which statements in Dalton’s original atomic theory are now considered to be
incorrect? Describe how modern atomic theory differs from these statements.
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2. 
Compare and contrast Thomson’s plum pudding atomic model with Rutherford’s
nuclear atomic model, and state why the plum pudding model was deemed incorrect.
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C.6A: Atomic Theory
Atomic Structure and Nuclear Chemistry
Part IV: Graphic Organizer
Using all of the following terms in the word bank, complete the timeline below.
Word Bank
Ernest Rutherford
Niels Bohr
J.J. Thomson
Democritus
John Dalton
Historical Contributions to Modern Atomic Theory
470-375 BC
1.______________________
Believed matter was made of
indivisible particles called atomos
1766 – 1844
2.________________________
English schoolteacher – Atomic
Theory (postulates)
1856 – 1940
3.__________________________
Plum pudding model – cathode
rays – discovery of the electron
1871 – 1937
4.__________________________
Gold foil experiment – nuclear
atom
1885 – 1962
5.__________________________
Quantum model - electrons of
Hydrogen exist only in specific
energy levels
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