CHEM 1305
Practice Exam # 2 (Chap. 4- 6)
Name:_____________________
Score:
PART I – Multiple Choice: (2 points each)
1. What is the term for the value which indicates the number of protons for an atom of a given
element?
A) Atomic notation?
B) Atomic number?
C) Atomic mass?
D) Mass number?
2. What is the term for the shorthand description of the arrangement of electrons by sublevels
according to increasing energy?
A) Atomic notation
B) Atomic number
C) Continuous spectrum
D) Electron configuration
3. What is the term for an orbit that electrons occupy at a fixed distance from the nucleus;
designated 1, 2, 3, 4….?
A) Energy level
B) Orbital
C) Shell.
D) Subshell
4. What is the simplest negative particle in an atom?
A) Alpha
B) Electron
C) Neuton
D) Proton
5. How many neutrons are in the nucleus of an atom of silver-107?
A) 47
B) 60
C) 107
D) 154
6. What is the name of the family of elements in Group IIA/ 2?
A) Alkali metals
B) Alkaline earth metals
C) Halogens
D) Noble gases
7. Which fifth period representative element has the highest atomic number?
A) Bi
B) Cd
C) Sr
D) Xe
8. Predict the number of valence electrons for a sulfur atom.
A) 4
B) 6
C) 8
D) 16
9. Which of the following is a general trend for the ionization energy of elements in the
periodic table?
A) Increases from left to right; increases from bottom to top
B) Increases from left to right; decreases from bottom to top
C) Decreases from left to right; increases from bottom to top
D) Decreases from left to right; decreases from bottom to top
10. What is the predicted ionic charge for a S ion?
A) 2+.
B) 2C) 6+
D)6-
11)
Which of the following subatomic particles are found outside the nucleus?
(a) electron and neutron
(d) all of the above
(b) neutron and proton
(c) proton and electron
(E) none of the above
60
12)
How many neutrons are in the nucleus of an atom of 27 Co?
(a) 27
(B) 33
(c) 60
(d) 87
(e) none of the above
23
13)
Given that the only naturally occurring isotope of sodium is Na, what is its isotopic
mass? (Hint: Refer to the Periodic Table.)
(a)11.00 amu
(b) 11.99 amu
(c) 12.00 amu
(D)22.99 amu
(e) 34.99 amu
14)
How many energy sublevels exist within the 4th energy level?
(a) 1
(b) 2
(c) 3
(D)4
(e) none of the above
15)
Which electron sublevel follows the 5p sublevel according to increasing energy?
(a) 4d
(b) 5d
(c) 5s
(D) 6s (e) 6p
16) What is the term for an atom (or group of atoms) that bears a charge as the result of gaining
or losing valence electrons?
A) anion
B) cation
C) ion
D) polyatomic ion
E) none of the above
17) Which of the following is a radioactive metal?
A) P
B) Pm
C) Po
D) Pr
18) Which of the following is a rare earth element?
A) Al
B) Be
C) Li
D) Sc
E) none of the above
E) none of the above
19) Predict the atomic radius for potassium, K, given the atomic radius of rubidium, Rb, (0.247
nm) and cesium, Cs, (0.265 nm).
A) 0.018 nm B) 0.229 nm
C) 0.238 nm D) 0.256 nm
E) 0.283 nm
20) Which element has the following electron configuration: [Kr] 5s2 4d10 5p2?
A) Pb
B) Sn
C) Sr
D) Xe
E) Zr
21) Which of the following elements has the highest ionization energy?
A) H
B) He
C) Ne
D) Cl
E) F
22) Which of the following ions is not isoelectronic with the noble gas xenon?
A) Te2- B) IC) Cs+
D) Ba2+
E) Sb3+
23) Which of the following has chemical properties most similar to zinc?
A) Al
B) Ga
C) Cd
D) Ag
E) Cu
PART II – Show your work: (8 points each)
24a. Element X has natural isotopes; X-63 (62.940amu) and X-65 (64.928amu). Calculate the
atomic mass of element X given the abundance of X-63 is 69.17%
b. Which element corresponds to each of the following electron configuration?
i. 1S2 2S2 2P5
ii. 1S2 2S2 2P6 3S2 3P6
iii 1S2 2S2 2P6 3S2 3P6 4S2 3d10 4P6 5 S2 4d5
iv. 1S2 2S2 2P6 3S2 3P6 4S2 3d10 4P6 5S2 4d10 5P5
25a. Predict the missing value (?) for each property listed below. The atomic radius, density,
and boiling point are given for elements in group VIIA/17
Element
Cl
Br
I
Atomic Radius
(?)
0.115nm
0.133nm
Density
1.56g/mL
(?)
4.97g/mL
Boiling Point
-34 - 34.60C
58. 58.80 C
(?)
b) Refer to the periodic table and write the predicted electronic configuration for each of the
following negative ions using core notation.
(i) F(ii) S2(iii) N3(iv) IC) According to general trends in the periodic table, predict which element in each of the
following pairs has the larger atomic radius
(i) Rb and Sr
(ii) As and Se
(iii) Pb and Bi
(iv) I and Xe
26. Complete the following table:
Symbol
Z
19
15
A
p+
e-
n0
charge
20
+1
N
27. Write the complete and short hand, electron configuration of the following elements:
Se2-: ______________________________________________ or _______________________
Ag : ______________________________________________ or _______________________
Co3+: ______________________________________________ or _______________________
I-: ______________________________________________ or _______________________