Multiple Choice
An atom that has an atomic number of 20 and a mass number of 42 is an isotope of an atom that has:
A) an atomic number of 21 and a mass number of 42
B) an atomic number of 20 and a mass number of 40
C) 22 neutrons and 20 protons
D) 22 protons and 20 neutrons
Correct Answer:
Verified
Correct Answer:
Verified
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