Of the four combinations of particles that form the nuclei of atoms, which one does NOT make up the nucleus of an isotope of the same element as the other three?
A) 7 protons, 9 neutrons
B) 8 protons, 10 neutrons
C) 8 protons, 9 neutrons
D) 8 protons, 8 neutrons

Question

Quizplus · Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons. Choices B, C, and D all have 8 protons, making them isotopes of the same element. Choice A has 7 protons, making it a different element.

Of the Four Combinations of Particles That Form the Nuclei