2. Atoms & Elements
Atomic Mass
Multiple Choice
Multiple ChoiceThree isotopic forms of potassium exist: 39K, 40K and 41K. Potassium has an atomic mass of 39.0983 amu. Potassium-40 has an isotopic mass of 39.9640 amu and natural abundance of 0.0117%. Potassium-41 has an isotopic mass of 40.9618 amu and natural abundance of 6.7302%. What is the isotopic mass of Potassium-39?
A
106.905 amu
B
38.9637 amu
C
106.903 amu
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