Question

Which among the following is wrong about isodiapheres?

• A. They have the same difference of neutrons and protons or same isotopic number
• B. Nuclide and its decay product after $\alpha$-emission are isodiapheres
• C. ${}_Z{A}^M⟶$ ${}_{Z-2}{B}^{M-4}{+}_2{He}^4$ '$A$' and '$B$' are isodiapheres
• D. All are correct

Answer 1

Answer: (D)

All are correct

$-$2 nuclides are called isodiaphers if they both have the same difference between the number of neutrons and protons.

$-$${}_Z^{A}X\underrightarrow{-\alpha }{}_{Z-2}^{A-4}Y$

$\Rightarrow$(A-Z)-Z (A-4-(Z-2)) - (Z-2) [Difference b/w the no. of neutrons and protons]

$A-2Z=A-2Z$

$\therefore$Nuclide and its decay product after $\alpha$-emission are isodiaphers.