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Question: Answered & Verified by Expert
An isobar of ${ }_{20} \mathrm{Ca}^{40}$ is
ChemistryStructure of AtomMHT CETMHT CET 2008
Options:
  • A $18 \mathrm{Ar}^{40}$
  • B ${ }_{20} \mathrm{Ca}^{38}$
  • C ${ }_{20} \mathrm{Ca}^{42}$
  • D ${ }_{18} \mathrm{Ar}^{38}$
Solution:
2705 Upvotes Verified Answer
The correct answer is: $18 \mathrm{Ar}^{40}$
Isobars have same atomic mass but different atomic number. Thus, the isobar of ${ }_{20} \mathrm{Ca}^{40}$ is ${ }_{18} \mathrm{Ar}^{40}$

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