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  1. Element with 18 neutrons and 20 protons
  2. Element with 19 neutrons and 18 protons
  3. Element with 19 neutrons and 20 protons
  4. Element with 22 neutrons and 18 protons
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Option 4 : Element with 22 neutrons and 18 protons

Isobar are atoms belonging to different elements with the same mass numbers but different atomic numbers. An element with same mass number as of calcium 40 will be its isobar. So, an element with 18 proton and 22 neutrons will be the isobar of Calcium.
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