Which of these are pairs of isobar?

  1.   6 C 12 , 8 O 16
  2.   6 C 13 , 6 O 14
  3.   20 Ca 40 , 18 Ar 40
  4. None of these

 

Answer

C. 20 Ca 40 , 18 Ar 40

 

 

Explanation: Isobars are atoms of different elements. They have different atomic numbers but same mass numbers.

 

Here, Calcium and Argon are different elements with the same mass numbers and different atomic numbers. Hence they are isobars.

  1. Class 9
  2. Chapter 4 Class 9 - Structure of Atom (Term 2)

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo