Subatomic Particles Practice Sheet
Fill in the blanks in the following sheet. Please keep in mind that the isotope represented by
each space may NOT be the one closest to the atomic mass in the periodic table (i.e. don't
use the periodic table to find masses).
If you have problems, the second page of this sheet will include tips for solving problems like
these (but not answers), with the answers themselves provided on page 3.
Atomic Symbol Atomic Number
Protons
B
Neutrons
Atomic Mass
6
11
24
31
37
8
29
14
35
26
56
P
31
20
36
Mn
39
84
30
9
33
19
42
C
12
V
51
This work is licensed under a Creative Commons Attribution - NonCommercial 4.0 International License, © Ian Guch, 2014
More chemistry tutorials and practice can be found at www.chemfiesta.com
Some handy hints:
If you're having trouble on this worksheet, here are some things you should keep in mind:
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Atomic number = number of protons.
Atomic symbol is determined by atomic number (check the periodic table!)
Atomic mass = protons + neutrons
Neutrons = atomic mass – protons
Electrons can't be determined with this information
This work is licensed under a Creative Commons Attribution - NonCommercial 4.0 International License, © Ian Guch, 2014
More chemistry tutorials and practice can be found at www.chemfiesta.com