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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

1 answer

Thallium-203

81

203

81

122

81-203

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