Which of the following pairs of atoms are isobars?
\(^{40}_{20}\text{Ca}\) and \(^{40}_{18}\text{Ar}\)
Isobars are atoms of different elements having the same mass number but different atomic numbers.
\(^{40}_{20}\text{Ca}\) has mass number 40 and atomic number 20, while \(^{40}_{18}\text{Ar}\) has mass number 40 and atomic number 18 - same mass number, different atomic number.
Hence, this is the correct answer.
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