The elements of which of the following pairs are isobars?
¹₁H and ³₁H
¹₁H and ²₁H
¹²₆C and ¹⁴₆C
⁴⁰₁₈Ar and ⁴⁰₂₀Ca
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC CDS-1 – 2020
In option D, ⁴⁰₁₈Ar (Argon) has an atomic number (Z) of 18 and a mass number (A) of 40. ⁴⁰₂₀Ca (Calcium) has an atomic number (Z) of 20 and a mass number (A) of 40. Since they have different atomic numbers but the same mass number, they are isobars.