Which Answer Below Best Describes All Atoms of a Given

Which answer below best describes all atoms of a given isotope of a particular element?

A) They possess the same mass but their other properties differ.
B) They possess similar chemical properties and the same mass but have nothing else in common.
C) They possess the same atomic number but have nothing else in common.
D) They possess the same number of electrons, the same atomic number, and similar chemical properties but differ in their masses.
E) They possess the same number of electrons, the same atomic number, the same mass, and the same chemical properties.