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Q. Isobars have:
Answer: Same mass numbers but different atomic numbers
Notes: 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. 40S, 40Cl, 40Ar, 40K, and 40Ca 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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