Isotope Practice Worksheet
Name:
Learning Target: Use isotope notation to determine: element name/symbol, atomic number, number
of electrons, number of neutrons, number of protons, mass number, atomic number, atomic mass.
Isotope Notation:
12
13
14
1. Here are three isotopes of an element:
6 C
6 C
6 C
a. The element is: __________________
b. The number 6 refers to the _________________________
c. The numbers 12, 13, and 14 refer to the ________________________
d. How many protons and neutrons are in the first isotope above? _________________
e. How many protons and neutrons are in the second isotope above? _________________
f. How many protons and neutrons are in the third isotope above? _________________
2. Complete the following chart:
Isotope name
235
92
atomic #
mass #
# of protons
# of neutrons
# of electrons
U
238
92
U
10
5
B
11
5
B
3. Complete the following chart:
Element
Symbol
Atomic
Number
Number of
electrons
Number of
Neutrons
Helium
2
2
Ti
22
73
Gallium
Mass
number
Isotope
Notation
50
68
108
28
39
13
6
C
226
88
83
83
127
Ra