Chemistry (Chang), 10th Edition

Chapter 7: Quantum Theory and the Electronic Structure of Atoms

Self Assessment A

1
Calculate the wavelength, in nanometers, of visible light having a frequency of 4.37 x 1014s-1.
A)12.0 nm
B)343 nm
C)686 nm
D)674 nm
E)None of the above
2
For the hydrogen atom, En = -(1/n2)RH, where RH = 2.18 x 10-18 J. The wavelength of the transition from the ground state to the n = 3 state is:
A)1.03 x 10-7 m
B)6.56 x 10-8 m
C)-1.03 x 10-7 m
D)-6.76 x 10-8 m
E)4.27 x 10-8 m
3
Which of the following is not a possible value of ml for an electron with l = 2?
A)-1
B)0
C)+1
D)+2
E)+3
4
The set of quantum numbers that correctly describes an electron in a 3p orbital is:
A)n = 3; l = 0; ml = 0; ms = 0
B)n = 3; l = 2; ml = -2, -1, 0, 1, or 2; ms = +1/2 or -1/2
C)n = 3; l = 1; ml = -1, 0, or 1; ms = +1/2 or - 1/2
D)n = 4; l = 0; ml = -1, 0, or 1; ms = +1/2 or -1/2
E)None of the above
5
What is the total number of orbitals associated with the principal quantum number n = 2?
A)1
B)2
C)3
D)4
E)None of the above
6
What is the maximum number of electrons that can be accommodated in the shell with n = 4?
A)32
B)18
C)24
D)10
E)None of the above
7
An atom of chromium has ___ unpaired electrons and is ___.
A)3, diamagnetic
B)5, diamagnetic
C)3, paramagnetic
D)5, paramagnetic
E)6, paramagnetic
8
The electronic configuration and filling order of the element whose atomic number is 26 is:
A)1s22s22p63s23p64s03d8
B)1s22s22p63s23p63d64s2
C)1s22s22p63s23p64s23d6
D)1s22s22p63s23p64s23d44p2
E)None of the above
9
An atom in its ground state contains 33 electrons. How many of these electrons are in p orbitals?
A)15
B)12
C)3
D)33
E)None of the above
10
Using the noble gas core designation, which of the configurations below correctly describes the ground state electron configuration of Cu?
A)[Ne]4s23d9
B)[Ar]4s23d9
C)[Kr]4s13d10
D)[Ar]4s13d10
E)None of the above
11
The Heisenberg uncertainty principle states that:
A)it is not possible to know either the momentum or position of an electron with precision
B)it is not possible to know the momentum of an electron without knowing the position
C)it is possible to know either the momentum or the position of an electron but not both simultaneously
D)none of the above
12
Emission spectra:
A)cannot be used to identify an unknown atom
B)can be used to identify unknown atoms
C)can be explained by the movement of protons colliding with electrons
D)none of the above
13
Bohr's Theory of the hydrogen atom was important because:
A)It gave a fixed value or quantized the energy levels of electrons.
B)It gave a fixed or quantized value to the nucleus of the atom.
C)It identified the ground level energies of several atoms.
D)None of the above
14
Energy emission by an electron is an energy releasing process, while energy absorption requires an input of energy.
A)True
B)False
15
De Broglie explained electron movements by relating them to:
A)waves only
B)particles only
C)waves and particles
D)none of the above
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