Download Quantum Numbers and Atomic Structure Honors

Quantum Numbers and Atomic Structure
Honors Chemistry
Please do not write on this exam
1. In an atom of argon-40, the number of protons
A)
B)
C)
D)
equals the number of electrons
equals the number of neutrons
is less than the number of electrons
is greater than the number of electrons
2. The total number of protons, electrons, and neutrons in each of four different atoms are shown in the table
below.
Which two atoms are isotopes of the same element?
A) A and D
B) A and Z
C) X and D
D) X and Z
3. Which two notations represent different isotopes of the same element?
A)
and
B)
and
C)
4. The atomic mass of titanium is 47.88 atomic mass units.
This atomic mass represents the
A) total mass of all the protons and neutrons in an
atom of Ti
B) total mass of all the protons, neutrons, and electrons
in an atom of Ti
C) weighted average mass of the most abundant
isotope of Ti
D) weighted average mass of all the naturally
occurring isotopes of Ti
5. The atomic mass of element A is 63.6 atomic mass units.
The only naturally occurring isotopes of element A are A
-63 and A-65. The percent abundances in a naturally
occurring sample of element A are closest to
A)
B)
C)
D)
31% A-63 and 69% A-65
50% A-63 and 50% A-65
69% A-63 and 31% A-65
100% A-63 and 0% A-65
D)
and
and
6. An orbital is a region of space where there is a high
probability of finding
A) a proton
C) a neutron
B) a positron
D) an electron
7. What is the total number of sublevels in the fourth
principal energy level?
A) 1
B) 2
C) 3
D) 4
8. A neutral atom in the ground state contains 16 electrons.
What is the total number of electrons in the 2p sublevel?
A) 6
B) 2
C) 8
D) 16
9. The greatest absorption of energy occurs as an electron
moves from
A) 1s to 3s
C) 4d to 4s
B) 3p to 3s
D) 4s to 3p
10. Which electron configuration represents an atom of
lithium in an excited state?
A) 1s 12s 1
C) 1s 22s 1
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B) 1s 12s 2
D) 1s 22s 2
11. What is the maximum number of electrons that can
occupy the 4d sublevel?
A) 6
B) 2
C) 10
14. Which electron notation represents the valence
electrons of a phosphorus atom in the ground state?
D) 14
A)
12. What is the total number of valence electrons in an
atom with the electron configuration 1s 22s 22p 63s 23p 3?
A) 5
B) 11
C) 3
B)
D) 15
13. An atom that has an electron configuration of
1s 22s 22p 63s 23p 63d 54s 2 is classified as
A)
B)
C)
D)
an alkali metal
an alkaline earth metal
a transition element
a noble gas element
C)
D)
15. In an atom of lithium in the ground state, what is the
total number of orbitals that contain only 1 electron?
A) 1
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B) 2
C) 3
D) 4
Answer Key
Quantum Numbers and Atomic Structures
1.
A
2.
A
3.
A
4.
D
5.
C
6.
D
7.
D
8.
A
9.
A
10.
B
11.
C
12.
A
13.
C
14.
B
15.
A
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