A) Same mass numbers but different atomic numbers
B) Different mass numbers but same atomic numbers
C) Same mass and atomic numbers
D) Different mass and atomic numbers
Correct Answer: A
Solution :
Isobars are (nuclides) atoms of different chemical elements that have the same number of nucleons. They differ in atomic number (number of protons) but have the same mass number.\[^{40}S,\]\[^{40}Cl,\]\[^{40}Ar,\]\[^{40}K\] and \[{{\,}^{40}}Ca\] are example of a series of isobars. The nuclei of these nuclides all contain 40 nucleons: however, they contain varying numbers of protons and neutrons.
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