[A] Isobars
[B] Isotopes
[C] Isomers
[D] Such species don’t exist
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The correct answer is [B] Isotopes
The atomic species of the same element differing in mass are called Isotopes.
Isotopes are atoms of the same element that have the same number of protons in their nucleus, but a different number of neutrons.
Because the number of protons in the nucleus determines the atomic number and the chemical properties of the element, isotopes of the same element have the same chemical properties, but may have different physical properties, such as melting and boiling points, and different nuclear properties, such as radioactivity.
[A] Isobars are species that have the same atomic mass but different atomic numbers.
[C] Isomers are species that have the same atomic number but different arrangements of atoms in the molecule
[D] Such species do exist and they are called Isotopes.