Atoms of different elements that have the same mass number (sum of protons and neutrons) but different atomic numbers (number of protons) are called isobars. Calcium has atomic number 20 and mass number 40. Argon has atomic number 18 and mass number 40. Since they have different atomic numbers (20 vs 18) but the same mass number (40), they are isobars.
Calcium (atomic number 20) and argon (atomic number 18) have a mass number of 40. What are they known as?
Asked in UPSC CDS 1 2017 · Topic: Atomic Structure (Isotopes, Isobars, and Isotones)
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