Question

Models of four atoms are shown as figures A, B, C, and D. Which two atoms represent isotopes of the same element?




A.
B and C


B.
C and D


C.
A and D


D.
B and D

Answer 1

We'll need the picture.

Answer 2

Isotopes are essentially the same element, just with different atomic masses. (atomic mass is measured by protons+neutrons, so in order to keep it as the same element, we can only add neutrons)

Answer 3

A and B have the same amount of protons, but their charge varies. C and D have the same amount of protons AND electrons, but different amounts of neutrons. So I would go with the answer B.

Answer 4

Thank you !