Name: _______________________________
Atomic Symbol Worksheet
*Atomic number is always the same as number of protons.
*# of protons = # of electrons unless you have an ION (+ or – charged atom such as
Cu+2). If ion is negative, then electrons were gained. If ion is positive, electrons are lost. The
magnitude of the charge indicates the number of electrons gained or lost.
*Mass number (atomic mass rounded off) = protons + neutrons
*When a symbol in a problem is written as:
14
6
C , the top number is the mass number
and the bottom is the atomic number.
*When atoms of the same element have different numbers of neutrons, we call them
ISOTOPES.
Fill in missing information:
Complete the following table.
Symbol
14
7
Name
Atomic
Number
Atomic
Mass
# of
Protons
# of
Neutrons
# of
Electrons
Overall
Charge
N
Neon
137
56
Ba
79
Lead
20
13
10
13
13
94
1
0
1
1
1
1
1
2
1
Uranium
24
12
Mg
7
3
Li
80
35
+2
+1
Br −1
Additional Nuclear Symbols
Another symbol for elements includes: Carbon – 12. The elements name is given instead of the symbol and 12
represents the mass number of the element.
Symbol
Carbon – 14
Protons
Neutrons
53
127
Electrons
Strontium – 90
Uranium - 235
Boron - 11
92
32
16
11
5
238