Which are isotopes? An atom that has an atomic number of 34 and a mass number of 76 is an isotope of an atom that has
A)an atomic number of 32 and a mass number of 76.
B)an atomic number of 34 and a mass number of 80.
C)42 neutrons and 34 protons.
D)42 protons and 34 neutrons.

Question

Quizplus · Accepted Answer

Isotopes are atoms of the same element with different numbers of neutrons. In this case, the atom with an atomic number of 34 and a mass number of 76 is an isotope of an atom with the same atomic number (34) but a different mass number (80). Therefore, option B is the correct choice. Option A has the same mass number but a different atomic number, which makes it a different element. Options C and D provide information about the number of neutrons and protons, but they do not match the given atom's characteristics, so they are not correct choices.

Which Are Isotopes? an Atom That Has an Atomic Number