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Unit 4 Test Practice
Unit 4 Test Practice
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1
An isotope of carbon contains 8 neutrons. Which isotope is it?
Carbon-8
Carbon-12
Carbon-14
Carbon-13
2
What is the atomic mass of nitrogen-15?
8
15
4
7
3
Zn-66 (atomic number 30) has
33 neutrons.
30 neutrons.
96 neutrons.
36 neutrons
4
What is the amu value of a proton?
0
1
-1
1.67 x 10^(-23)
5
Isotopes vary in their numbers of
protons
electrons
neutrons
quarks
6
An atom is net zero charge if:
nuclear forces stabilize the charges
the numbers of protons and neutrons are equal.
the numbers of protons and electrons are equal.
neutrons balance the protons and electrons
7
How many
protons
are in nitrogen-15?
15
8
7
4
8
The atomic number is the number of
electrons
protons
neutrons
sum of all of the above
9
Of the following, the smallest and lightest subatomic particle is the _______.
electron
neutron
nucleus
proton
10
How many
neutrons
are in nitrogen-15?
8
4
7
15
11
How many
protons
does Sodium-
23
have?
23
11
9
10
12
How many
neutrons
does Sodium-
23
have?
12
23
11
10
13
How many electrons does a neutral lithium atom (atomic number 3) have
6 electrons
1 electrons
12 electrons
3 electrons
14
How many neutrons are in an atom of Cobalt-60?
60
27
33
58
15
The atomic number of nitrogen, 7, indicates that there are seven
energy levels in the nitrogen atom's nucleus.
nitrogen nuclides.
protons in the nucleus of an nitrogen atom.
neutrons outside the nitrogen atom's nucleus.
16
Assuming this is a nuetral atom what element is this?
Carbon
Fluorine
Oxygen
Nitrogen
17
What is the atomic mass of a carbon isotope which has 8 neutrons?
16
14
8
32
18
In a neutral atom, the number of protons equals the number of
quarks
neutrons
nutrinos
electrons
19
The average atomic mass of sodium is 22.99 amu. Which isotope is most common?
Sodium-22
Sodium-23
20
An oxygen isotope consists of 8 protons, 8 electrons, and 7 neutrons. Its mass number is
23
15
16
8
21
The amu Value of a Proton is equal to the Amu value of an Neutron?
True
False
22
What is the atomic mass of this atom?
30
15
45
31
23
Zn-66 (atomic number 30) has
96 neutrons.
36 neutrons
33 neutrons.
30 neutrons.
24
Which isotope has 10 protons and 11 neutrons?
Ne-11
Ne-10
Ne-21
Na-21
25
Helium has an average mass of 4.0026. Which of these isotopes is the most common?
He - 5
He - 4
none of these
He - 3
26
How many
electrons
does Ca have if the net charge is +2?
20
40
18
22
27
The total number of protons and neutrons in the nucleus of an atom is its
Avogadro constant
number of neutrons
atomic number
mass number
28
What is the charge of a magnesium ion if it has 12 protons and 10 electrons?
+1
+2
neutral
-2
29
What is the amu value for an electron?
1.67 x 10^(-23)
1
0
-1
30
Removing a neutron will change the mass of an atom?
False
True
31
How many
neutrons
does Sodium-
22
have?
10
12
11
23
32
How many protons does a neutral lithium atom (atomic number 3) have
3 protons.
12 protons
6 protons
1 proton
33
What is the charge of a magnesium ion if it has 12 protons and 10 electrons?
+2
+1
neutral
-2
34
What subatomic particle determines the identity of an element?
neutrons
quark
protons
electrons
35
Which isotope has 13 protons and 12 neutrons?
Al- 13
Al-26.98
Al-25
Mg-12
36
The first theory of atoms was called:
nuclear
plum pudding
solar system
solid sphere
