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# Download Atomic Math #2

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```Atom Number Homework # 2
Name ___________________
Period ________ Date _______
Fill in the boxes on the following chart. You may use a Periodic chart to help you
when necessary. Round Atomic weight to get the Mass Number and make sure you
show all Neutron calculations.
Atomic Number = Number of Protons = Number of Electrons
Number of Protons + Number of Neutrons = Atomic Weight
Name &
Atomic
Symbol
number
Strontium
38
Sr
Hydrogen
1
H
Vanadium
23
V
Ruthenium
Ru
Molybdenum
42
Mo
Hafnium
Hf
Europium
Eu
Name &
Atomic
Symbol
number
Neodymium
Nd
Krypton
36
Kr
Indium
49
In
Xenon
54
Xe
Iridium
Ir
Rubidium
Rb
Terbium
65
Tb
Atomic
# of
# of
weight Protons Electrons
87.62
38
# of
Neutrons
1.00
1
50.94
101.07
51-23 = 28
44
96-42 = 54
72
151.96
Atomic
# of
# of
weight Protons Electrons
144.24
60
114.82
192.22
# of
Neutrons
54
115
131
77
192
37
65
Mass
Number
144
84
115-49 = 66
85.46
158.92
152
36
131.3
96
178
63
83.8
51
101
95.94
178.49
Mass
Number
88
85
159-65 = 94
159
Name & Atomic
# of
# of
Symbol
weight Protons Neutrons
Bromine
79.90
35
Br
Antimony 121.75
122-51 = 71
Sb
Helium
He
Tungsten 183.85
74
W
Chromium
Cr
196.96
# of
Mass
Atomic
Electrons Number number
35
4
2
128
52
40-18 = 22
Tellurium
Te
Cadmium
Cd
112.41
48
70-31 = 39
31
1. How many neutrons does this atom have (show work)?
2. What is the atomic number for this atom?
3. How many electrons does this atom have?
17 protons
? Neutrons
4. What is the name of this atom?
Atomic Mass is 35
5. What is the atomic mass of this atom (show work)?
6. How many electrons does this atom have?
33 protons
42 Neutrons
7. What is the name of this atom?
Atomic Mass is ?
```
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