Name _________________________________ Period _________ Date _____________
Atoms and Isotopes Worksheet
1. Fill in the table with the correct information.
Isotope
Isotope
Atomic #
Notation
Protons
Electrons
Neutrons
Oxygen-16
Bromine-80
Uranium235
Copper-64
2.
Describe the general arrangement of subatomic particles in the atom.
3. What contribution did these scientists make to atomic models of the atom?
a. Dalton
b. Thomson
c. Rutherford
4. What is the isotope notation of the element that has an atomic number of 24 and a mass number of 52?
5. What part of the atom contains practically all its mass?
6. How do the isotopes of an element differ? How are they the same?
7.
Which element contains the largest number of neutrons per atom?
a. Bismuth-210 b. Polonium-210
c. Astatine-210
d. Astatine-211
8. Fill in the following table.
Isotope
Isotope
Notation
Nickel-58
Atomic #
Protons
Electrons
15
53
36
34
Neutrons
15
74
48
45
Calcium-40
Chlorine-37
9. Calculate the average atomic mass of chlorine if its isotopes and % abundances are as follows. Show
all work.
Mass of Isotope
% abundance
36.96590
24.47
34.96885
75.53
Name _________________________________ Period _________ Date _____________
Atoms and Isotopes Worksheet
Fill in the table with the correct information
Isotope
Isotope notation Atomic # Protons Electrons neutrons
Oxygen-16
8
8
8
8
16
8
Bromine-80
Uranium-235
O
80
35
235
92
Br
U
35
35
35
45
92
92
92
143
Copper-64
29
29
29
35
64
29
1. Describe the general arrangement of subatomic particles in the atom
Electrons surround the nucleus; protons and neutrons are in the nucleus.
2. What contribution did these scientists make to atomic models of the atom?
a.
Dalton – 1st atomic theory
b.
Thomson- electron
c.
Rutherford- nucleus
3. What is the isotope notation of the element that has an atomic number of 24 and a mass number of 52.
Cu
4. What part of the atom contains practically all its mass? nucleus
5.
52
24
Cr
How do the isotopes of an element differ? How are they the same?
They have different #s of neutrons; same number of protons
6. Which element contains the largest number of neutrons per atom?
a. Bismuth-210
b. Polonium-210
c. Astatine-210
d. Astatine-211
7. Fill in the following table
Isotope
Isotope Not Atomic # Protons Electrons Neutrons
58
Nickel-58
28
28
28
30
Ni
28
Phosphorus-30
30
15
P
15
15
15
15
Iodine-127
127
53
I
53
53
53
74
Krypton-84
84
36
Kr
36
36
36
48
Selenium-79
79
34
Se
34
34
34
45
Calcium-40
40
20
Ca
20
20
20
20
Chlorine-37
37
17
Cl
17
17
17
20
8. Calculate the average atomic mass of chlorine if its isotopes and % abundance are as follows. Show
work.
Mass of Isotope
% abundance
36.96590
24.47
(.2447)(36.96590) = 9.04556
34.96885
75.53
(.7553)(34.96885) = 26.41200
35.4575amu