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Which Are Isotopes? an Atom That Has an Atomic Number

Question 157

Multiple Choice

Which are isotopes? 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.

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