A. Mass number
A.
B. Neutron number
B.
C. Proton number
C.
D. Atomic number
D.
Correct Answer: B
সঠিক উত্তর: B
Explanation
ব্যাখ্যা
Isotones are different elements that have the same number of neutrons, but a different number of protons. This means they have the same neutron count, but different atomic numbers, making them distinct elements.