Four atoms have the number of protons and neutrons
given below. Which two atoms are isotopes of the same element?

W: 8 protons and 8 neutrons
X: 8 protons and 10 neutrons
Y: 10 protons and 8 neutrons
Z: 9 protons and 10 neutrons

A. X and Y
B. W and X
C. X and Z
D. W and Y​​

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