SI Mock Exam
CH 115-2A
Multiple Choice
1. Which of the following is an invalid set of quantum numbers?
a) (3, 2, -1, ½)
b) (3, 3, 1, -1/2)
c) (1, 0, 0, ½)
d) (2, 1, 0, ½)
2. The energy of a photon of light is doubled. What will happen to the wavelength and frequency of this
light, respectively?
a) Halved, halved
b) Doubled, halved
c) Halved, doubled
d) Doubled, quadrupled
3. How much energy is (absorbed/emitted) by the atom when an electron jumps from n=1 to n=3?
a) Absorbed, 2.42 x 10-19
b) Absorbed, -2.42 x 10-19
c) absorbed, 1.94 x 10-18
d) emitted, -1.94 x 10-18
4. How many protons, neutrons, and electrons (respectively) are present in 160Au?
a). 79, 81, 79
b). 81, 79, 81
c). 80, 80, 80
d). 79, 81, 81
5. Which of the following is not an expected common monatomic ion?
a). O2b). N3+
c). Na1+
d). Se26. Which of the following represents the ground-state electron configuration for the neutral atom Zr?
a). 1s2 2s2 2p6 3s2 3p6 4s2 4d10 4p6 5s2 5d2
b). 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
c). 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d2
d). 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d3
7. Select all of the atoms that have the same number of neutrons.
I. 37Cl and 40Ca
II. 42Sc and 43Ti
III. 41Sc and 38K
a). I only
b). II only
c). I and II only
d). I and III only
e). I, II, and III
8.
If a photon of light has a wavelength of 540 nm, what is the frequency and energy of this photon,
respectively?
a) 5.56 x 1014, 3.68 x 10-19
b) 5.40 x 1013, 3.68 x 10-19
c) -5.56 x 1014, -3.68 x 10-19
d) 3.16 x 1014, 3.68 x 10-19
9. The atomic weight of copper is 63.55 amu. In a sample of the element, 69.17% of copper is present as
Cu-63 with an atomic mass of 62.939 amu. What is the atomic mass of the other isotope and how many
neutrons does it contain?
a). 64.92 amu, 29 neutrons
b). 64.92 amu; 36 neutrons
c). 45.9 amu; 17 neutrons
d). 63.55 amu; 36 neutrons
10. Which of the following contains a halogen, an alkali metal, and a metalloid in that order?
a). Kr, Na, B
b). Br, Cs, Si
c). Cl, Ba, Zn
d). F, Be, Si
11. Indicate the correct set of four quantum numbers for the electron of highest energy in the ground-state
configuration of Na.
a). (2, 1, 1, -1/2)
b). (3, 1, 0, ½)
c). (3, 0, 0, ½)
d). (3, 1, 1, ½)
12. Give the correct electron configuration of Mo.
a) [Ar] 4s2 3d4
b) [Kr] 5s2 4d4
c) [Kr] 5s1 4d4
d) [Kr] 5s1 4d5
13. Order the following elements in highest to lowest ionization energy: Ge, Ca, Ga, Kr, Se
a) Ca, Ga, Ge, Se, Kr
b) Kr, Se, Ge, Ga, Ca
c) Kr, Ca, Ga, Se, Ge
d) Se, Ge, Ga, Ca, Kr
14. Which one of the elements has the largest atomic radius?
a) Na
b) Kr
c) F
d) Fr
15. Which has the largest atomic/ionic radius?
a) Cl
b) Clc) Na+
d) Mg2+
16. Which of the following statements are true?
I. Each set of d orbitals contains 7 orbitals.
II. Each set of d orbitals can hold a maximum of 14 electrons.
III. The first energy level contains only s and p orbitals.
IV. The s orbital in any shell is always spherically symmetrical.
a). I and II only
b). I, III, and IV only
c). IV only
d). III only
17. In another universe, element X has 3 naturally occurring isotopes: 100X, 102X, and 105X. If the atomic
weight of X is 100.73 amu, which isotope has the highest natural abundance?
a). 100X
b). 102X
c). 105X
d). It cannot be determined from the information given.
18. Consider two electron transitions. In the first case, an electron falls from n=4 to n=2, giving off a photon
of light with a wavelength equal to 488 nm. In the second transition, an electron moved from n=3 to
n=4. For this transition, we would expect that:
a). energy is emitted, and the wavelength of the corresponding photon will be shorter than the first
transition
b). energy is emitted, and the wavelength of the corresponding photon will be longer than the first
transition
c). energy is absorbed, and the wavelength of the corresponding photon will be shorter than the first
transition
d). energy is absorbed, and the wavelength of the corresponding photon will be longer than the first
transition
19. How many electrons and neutrons, respectively, does 50Cr+ have?
a) 26, 23
b) 26, 50
c) -1, 26
d) 23, 26
20. Which quantum number describes the size and shape of the orbital?
a) n
b) l
c) n and l
d) n and ml
21. Which statement is false?
a) Cations are smaller than their parent ion.
b) Anions are larger than their parent ion.
c) Mg2+ is larger than Be2+.
d) O2- and F- are the same size
22. How many valence electrons does Te have?
a) 5
b) 6
c) 3
d) 8
23. What is the formula for potassium nitride?
a) KN
b) K2N2
c) K3N
d) KN3
24. List in the order of increasing electronegativity: Ga, In, B, Al
a) In, Ga, Al, B
b) B, Al, Ga, In
c) In, Ga, B, Al
d) Al, B, Ga, In
Short Answer
1. Give the formula for the following compounds.
i.
Cobalt (II) fluoride
ii.
Potassium sulfide
iii.
Silver Oxide
iv.
Copper (II) phosphide
v.
Iron (III) oxide
2. Name each ionic compound.
i.
CuBr2
ii.
BeO
iii.
FeS
iv.
NiCl3
v.
AlI3
3. The average atomic weight for element X is 242.5 amu. X has 3 isotopes with relative abundances as
follows: 242X at 84%, 243X at an unknown percentage, and 244X at an unknown percentage. Find the
percentage abundance of the other two isotopes. Assume protons and neutrons both have a mass of
1amu.
4. Draw the 2px orbital and the 4py orbital (be sure to include the relative size in the drawing). Which
orbital holds the most electrons and what number of electrons does it have?
5. Write these ions from smallest ionic radii to largest ionic radii: Br-, Ca2+, As3-, Te2--, Na+