Name: __________________________________ Period: _______ Atomic Structure

Name: __________________________________ Period: _______
Atomic Structure
You can become more familiar with the atomic structure of some common substances
by completing the chart below. For each substance, you have been given enough
information to fill in all the blanks.
Number Number Number
Atomic
Mass
of
of
of
Substance Symbol Number Number Protons Neutrons Electrons
Helium
He
2
Magnesium
Mg
12
Zinc
Zn
30
Bromine
Br
Aluminum
Al
Uranium
U
Sodium
Na
Krypton
Kr
Calcium
Ca
Silver
Ag
4
12
65
80
35
13
14
146
11
92
12
48
40
20
47
61
36
Complete the following chart by filling in the blanks. Use the Periodic Table to help.
A
P
E
Atom
1.
Atomic Number =
Protons =
Electrons
Symbol
M
A
N
Atomic
number
Mass –
Atomic Number =
Neutrons
Number of Number of
protons
electrons
hydrogen
2.
5
3.
10
4.
Cr
5.
6.
7
gold
7.
13
8.
33
9.
He
10.
11.
14
iron
12.
F
13.
30
14.
16
15.
20
16.
17.
Sn
chlorine
18.
6
19.
20.
80
iodine
21.
22.
Kr
uranium