Chemistry: Matter and Change

Section 2: Quantum Theory and the Atom

Self Check Quizzes

1
What is the maximum number of electrons that can be present in each principal energy level of hydrogen?

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A)n
B)n2
C)2n
D)2n2
2
What is the lowest energy state of an atom called?
A)the ground state
B)the excited state
C)the solid state
D)the chaotic state
3
The concept that all moving particles have wave characteristics is attributed to ___________.
A)de Broglie
B)Thomson
C)Heisenberg
D)Bohr
4
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In the figure above, why must the photon's wavelength increase after the collision?
A)The photon changes direction.
B)The photon changes speed.
C)The photon gives up some energy to the electron.
D)The photon starts spinning.
5
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In the figure above, why are there dots beyond the "boundary" of the atomic orbital?
A)the boundary encloses the volume in which the electron is found 90% of the time
B)the boundary is three-dimensional, while the picture shows only two dimensions
C)experimental error
D)the boundary encloses the volume in which the electron is found 50% of the time
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