Question

Which of the following pairs are isobars? *

1 point

17Cl35 & 17Cl37

18Ar40 & 20Ca40

6C12 & 6C14

None of these

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Answer 1

Answer:

Isobars - isotopes with same atomic weight

18Ar40 & 20Ca40

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Answer 2

¹⁸Ar₄₀ and ²°Ca₄₀ are the pairs of isobars.

• Isobars are those which have the same mass numbers but different atomic numbers.
• Isobars have the same number of neutrons.
• Isobars differ in atomic numbers i.e. number of electrons and protons.
• The physical properties of the isobars are the same.
• The atomic number of Argon and Calcium is 18 and 20 respectively, but the mass number of Argon and Calcium is 40.