Which of the following represent isotopes?
A: X B: X C: X D: X
A) A and B
B) A and C
C) A and D
D) C and D

Question

Which of the following represent isotopes?
A:  X B:  X C:  X D:  X
A) A and B 
B) A and C 
C) A and D 
D) C and D

Quizplus · Accepted Answer

Isotopes have the same number of protons but differ in the number of neutrons. In this case, all the options have the same number of protons (11), but only options A, B, and C differ in the number of neutrons. The correct answer is B because A and B have the same number of neutrons (17) but differ in the number of electrons, which are not relevant for isotopes. Option C and D have different numbers of neutrons than A and B, so they are not isotopes.

Which of the Following Represent Isotopes