Atoms And Isotopes Worksheet Page 2
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2Name _________________________________ 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
O
8
Bromine-80
35
35
35
45
80
Br
35
Uranium-235
92
92
92
143
235
U
92
Copper-64
29
29
29
35
64
Cu
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?
Dalton – 1st atomic theory
a.
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.
4. What part of the atom contains practically all its mass? nucleus
52
Cr
5. How do the isotopes of an element differ? How are they the same?
24
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
Nickel-58
28
28
28
30
58
Ni
28
Phosphorus-30
15
15
15
15
30
P
15
Iodine-127
53
53
53
74
127
I
53
Krypton-84
36
36
36
48
84
Kr
36
Selenium-79
34
34
34
45
79
Se
34
Calcium-40
20
20
20
20
40
Ca
20
Chlorine-37
17
17
17
20
37
Cl
17
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
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