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WorksheetsIsotopes
Total questions: 11
Worksheet time: 7mins
Name
Class
Date
1.
How many protons does this isotope of titanium have?
a)
48
b)
22
c)
26
d)
70
2.
How many neutrons does the isotope of lithium have?
a)
8
b)
3
c)
4
d)
5
3.
How many neutrons does uranium-235 have?
a)
238
b)
92
c)
146
d)
143
4.
What do these isotopes of carbon all have in common?
a)
neutrons & mass number
b)
atomic number and neutrons
c)
atomic number and electrons
d)
protons, atomic number, and mass number
5.
In a correctly written symbol what would be located in the "A" position?
a)
number of neutrons
b)
atomic number
c)
number of electrons
d)
mass number
6.
What element is this? What is the mass number of this atom?
a)
sodium, 23
b)
magnesium, 23
c)
magnesium, 12
d)
sodium, 11
7.
Calculate the average atomic mass of silver.
a)
106.38649amu
b)
111.91896amu
c)
107.8677amu
d)
121
8.
Copper occurs naturally as Cu-63 and Cu-65. Which isotope is more abundant?
a)
Cu-63
b)
Cu-65
9.
Calculate the average atomic mass of element X when 34% of element X exists as X-272 and the remainder exists as X-274.
a)
185.64amu
b)
273.32amu
c)
272.68amu
d)
27.33amu
10.
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
11.
Magnesium consists of three naturally occurring isotopes. The percent abundance of these isotopes is as follows: 24Mg (78.70%), 25Mg (10.13%), and 26Mg (11.7%). The average atomic mass of the three isotopes is 24.3050 amu. If the atomic mass of 25Mg is 24.98584 amu, and 26Mg is 25.98259 amu, calculate the actual atomic mass of 24Mg.
a)
23.985 amu
b)
21.421 amu
c)
24.463 amu
d)
24.002 amu
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