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History Of Atomic Theory Review
Test Description: Answer the questions and fill out your study guide.
Instructions: Answer all questions to get your test result.
1) Which scientists offered proof that atoms exist?
A
Aristotle
B
Isaac Newton
C
Democritus
D
John Dalton
2) Which of the following models shows how unpredictable electrons are?
A
The atom is a solid, uniform ball.
B
A solid ball with electrons intersperse througout
C
The electron cloud shows the movement of electrons
D
A small ball in a large empty electron shell.
3) Which of the following properties did Rutherford use in his experiment?
A
the positive charge of the electrons in a uniform negative charge
B
the negative charge of the alpha particles and the positive charge of the gold foil
C
the negative change of the alpha particles and the random distribution of protons
D
the positive charge of the alpha particles and the negative charge of the electrons
4) Dalton's experiments advanced our understanding of the atom without
A
testing a hypothesis
B
carefully observing and measuring events
C
examining the ratios of elements involved in chemical reactions
D
discovering the internal structure of the atom
5) In Rutherford's gold foil experiment the alpha particles pass through which part of the atom?
A
the proton shield
B
the nucleus
C
the electron cloud
D
the valence electron shell
6) A electron enters ___________when it has absorbed energy and moved to a higher energy level.
A
a quantum level
B
a ground state
C
an excited state
D
an orbit
7) Electrons are never found in-
A
energy shells
B
an electron cloud
C
a nucleus
D
energy levels
8) Bohr believed that light is emitted by a electron when
A
the electron completes a revolution in its orbit
B
the electron's energy changes
C
the electron's fixed orbit shifts
D
the electron changes direction in its orbit
9) British physicist J.J. Thomson was the first to identify the
A
electron
B
neutron
C
atomic theory
D
proton
10) The building blocks of matter are
A
electrons
B
found only in the plasma state
C
as of yet undiscovered
D
atoms and molecules
*select an answer for all questions
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