Atoms and Electrons REVIEW
True/False
Indicate whether the statement is true or false.
____
1.
The mass of an electron is extremely small compared to the mass of a proton.
____
2.
Carbon-14 or 14C contains 14 neutrons.
____ 3.
that element.
The atomic mass shown on the periodic table is actually an average of atomic masses for
____
4.
Being of the same nature, electrons attract each other.
____
5.
The modern periodic table is arranged by increasing atomic mass of the elements.
____
6.
Aristotle named atoms atoms.
____ 7.
In the notation
mass of silver.
, 107 represents the atomic number and 47 represents the atomic
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
8.
How many protons does an oxygen atom have?
a. 8
c. 32
b. 16
d. It depends on the charge of the atom.
____
9.
How many neutrons does an oxygen atom have?
a. 8
c. 32
b. 16
d. It depends on the charge of the atom.
____
10.
How many neutrons does the ferric ion Fe3+ have?
a. 13
c. 26
b. 23
d. 52
____
11.
What is the mass number of the ferric ion Fe3+?
a. 10
c. 26
b. 13
d. 52
____
12.
What is the number of electrons in
N (element: nitrogen)?
a. 7
c. 14
b. 8
d. 15
Consider the following electronic configuration: 1s2 2s22p6 3s2
____
13.
How many electrons are present in this atom?
a. 4
c. 12
b. 8
d. 24
____
14.
How many electrons in this atom are at the second energy level?
a. 4
c. 16
b. 8
d. 32
____
15.
What element in the periodic table corresponds to that electron configuration?
a. Calcium
c. Sodium
b. Aluminum
d. Magnesium
____
16.
Which energy levels have been completely filled?
a. Only the first energy level.
c. The second and third energy levels.
b. The first and second energy levels.
d. They are all partially filled.
____
17.
The box for an element from the periodic table is shown. Which is the atomic mass?
a. A
c. C
b. B
d. D
____
18.
Which has a charge of +1?
a. proton
c. electron
b. atom
d. neutron
Atoms
Atom
Protons
Neutrons
Electrons
1
8
10
8
2
10
9
10
3
9
9
9
4
8
11
8
____
19.
Which two are isotopes of one another?
a. Atoms 1 & 2
c. Atoms 1 & 3
b. Atoms 2 & 3
d. Atoms 1 & 4
____
20.
Which is the correct symbol for this atom?
a.
c.
b.
d.
____
21.
Which is the correct symbol for the atom with 42 protons and 49 neutrons?
a.
c.
b.
d.
Short Answer
22.
What is the average atomic mass of this element?
Isotope
Mass (amu)
Percent Abundance
Phosphorus-29
29
5%
Phosphorus-31
31
71%
Phosphorus-32
32
24%
Atoms and Electrons REVIEW
Answer Section
TRUE/FALSE
NAT:
NAT:
1.
ANS:
T
PTS:
1
DIF:
Easy
REF:
Section 5.1
2.
ANS:
F
PTS:
1
DIF:
Easy
REF:
Section 5.1
3.
ANS:
T
PTS:
1
DIF:
Easy
REF:
Section 5.1
4.
ANS:
F
PTS:
1
DIF:
Easy
REF:
Section 5.1
5.
ANS:
T
PTS:
1
DIF:
Bloom's Level 2
UCP.2 | B.1
STA:
ABC 10.1 | ABC 10.2
6.
F
PTS:
UCP.2 | G.3
STA:
ABC 10.1 | ABC 10.2
7.
F
ANS:
ANS:
1
DIF:
Bloom's Level 1
In a shortened type notation of an element, the mass number and the atomic number are written to the left
of the symbol. The mass number is written as a superscript and the atomic number is written as a subscript.
PTS:
1
DIF:
OBJ:
4.3.2 Define an isotope and explain why atomic masses are not whole numbers.
NAT:
B.1
STA:
1
REF:
ABC 10.1
Page 100
TOP:
Define an isotope and explain why atomic masses are not whole numbers.
KEY:
Notation of elements
NOT:
The atomic number and mass of an element can be represented by shortened notations.
MSC:
2
MULTIPLE CHOICE
8.
ANS:
A
PTS:
1
DIF:
Easy
REF:
Section 5.1
9.
ANS:
A
PTS:
1
DIF:
Easy
REF:
Section 5.1
10.
ANS:
C
PTS:
1
DIF:
Easy
REF:
Section 5.1
11.
ANS:
D
PTS:
1
DIF:
Easy
REF:
Section 5.1
12.
ANS:
A
PTS:
1
DIF:
Easy
REF:
Section 5.1
13.
ANS:
C
PTS:
1
DIF:
Easy
REF:
Section 5.3
14.
ANS:
B
PTS:
1
DIF:
Easy
REF:
Section 5.3
15.
ANS:
D
PTS:
1
DIF:
Easy
REF:
Section 5.3
16.
ANS:
B
PTS:
1
DIF:
Easy
REF:
Section 5.3
17.
ANS:
D
PTS:
1
DIF:
Bloom's Level 3
NAT:
NAT:
NAT:
NAT:
NAT:
UCP.2 | B.1
STA:
ABC 10.1 | ABC 10.2
18.
ANS:
A
PTS:
B.1
STA:
ABC 10.1 | ABC 10.2
19.
ANS:
D
PTS:
UCP.2 | B.1
STA:
ABC 10.1 | ABC 10.2
20.
D
PTS:
UCP.2 | B.1
STA:
ABC 10.1 | ABC 10.2
21.
B
PTS:
STA:
ABC 10.1 | ABC 10.2
ANS:
ANS:
UCP.2 | B.1
1
1
1
1
DIF:
Bloom's Level 1
DIF:
Bloom's Level 4
DIF:
DIF:
Bloom's Level 3
Bloom's Level 3
SHORT ANSWER
22.
ANS:
(29*.05)+(31*.71)+(32*.24) = 31.14 amu
PTS:
1
DIF:
Bloom's Level 3
STA:
ABC 10.1 | ABC 10.2
NAT:
UCP.2 | B.1