Question

Assertion :An atom on losing an $\alpha$-particle forms its isodiapher. Reason: Isodiaphers are the elements having same difference in their neutrons and protons.

• A. $S$ is correct but $E$ is wrong
• B. $S$ is wrong but $E$ is correct
• C. Both $S$ and $E$ are correct and $E$ is correct explanation of $S$
• D. Both $S$ and $E$ are correct but $E$ is not correct explanation of $S$

Answer 1

The correct option is C Both $S$ and $E$ are correct and $E$ is correct explanation of $S$

When an atom loses an alpha particle, its atomic number decreases by 2 and its mass number decreases by 4.
Thus the number of protons and neutrons decreases by 2 each.
Hence, the difference in the number of neutrons and protons of the original atom and the new atom is same.
Isodiaphers are the elements having same difference in their neutrons and protons.
Thus, an atom on losing an -particle forms its isodiapher.