Thallium-201 is used in stress tests to diagnose coronary artery disease. Complete the following table for two isotopes of thallium.
Isotope name
Atomic
Number
Mass
number
Number of
protons
Number of
neutrons
Isotope
symbol
Thallium-201
X
5
Thallium-203
Thallium-203
81
203
81
122
81-203