An isotope has the same Atomic number but a different Mass number, therefore the correct answer is option D.
What is the atomic number?
An atom's atomic number is determined by the total number of protons it contains. Both the number of neutrons and the number of electrons present inside an atom have no relation to the atomic number.
While the atomic mass of an atom is the sum of the total number of protons and the number of neutrons present inside of any atom.
Isotopes are distinct forms of an element with varying numbers of neutrons but with the same numbers of protons same as the atomic number
while isobars are the elements with the same atomic mass but different atomic numbers.
Thus, an isotope has the same Atomic number but a different Mass number, therefore the correct answer is option D.
Learn more about the atomic number from here
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