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WorksheetsIsotopes
Total questions: 14
Worksheet time: 1hrs 10mins
Name
Class
Date
1.
How many neutrons does the isotope of lithium have?
a)
8
b)
3
c)
4
d)
5
2.
What quantities vary between isotopes of an element?
a)
protons, electrons, and atomic mass
b)
protons, electrons, and atomic number
c)
neutrons and electrons
d)
neutrons and atomic mass
3.
Isotopes are atoms of the same element with different #’s of __________ & therefore different __________.
a)
n0 ; atomic #’s
b)
p+ ; atomic #’s
c)
e- ; atomic masses
d)
n0 ; atomic masses
4.
If the number of electrons in an atom changes you make a(n) __________________.
a)
ion
b)
isotope
c)
new element
d)
isomer
5.
Bromine-80 has how many neutrons?
a)
41
b)
42
c)
44
d)
45
6.
76 protons and 114 neutrons
a)
Osmium-114
b)
Osmium-76
c)
Osmium-190
d)
Osmium-190.23
7.
There are two primary isotopes found in any sample of copper: copper-63 and copper-65. The isotope 65Cu composes 69.2% of the sample and 63Cu comprises the other 30.8%. Based on this data, what is the atomic mass of copper?
a)
29 amu
b)
63.546 amu
c)
64.4 amu
d)
63.6 amu
8.
Rubidium has two common isotopes, 85Rb and 87Rb. If the abundance of 85Rb is 72.2% and the abundance of 87Rb is 27.8%, what is the average atomic mass of rubidium?
a)
85.468 amu
b)
37 amu
c)
85.6 amu
d)
86.4 amu
9.
Which of the subatomic particles is the lightest
a)
all have the same mass
b)
protons
c)
neutrons
d)
electrons
10.
An element is defined by its number of
a)
protons
b)
electrons
c)
neutrons
d)
protons + electrons
11.
Found in the nucleus of the atom
a)
electrons only
b)
protons only
c)
neutrons and protons
d)
neutrons and electrons
12.
24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?
What is the average mass of this element?
a)
74.92 amu
b)
24.97 amu
c)
75.01 amu
d)
74.51 amu
13.
If X is the symbol for an element, which of the following two symbols represent isotopes of the same element? I. 7735X II. 7733X III. 8137X IV. 8135 X
a)
I and II
b)
III and IV
c)
I and IV
d)
I and III
14.
If an atom of oxygen has a charge of -2, how many electrons does the atom have?
a)
18
b)
6
c)
8
d)
10
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