The isotope that causes skin disease is

$_6C^{11}$ and $_5B^{11}$ are referred to as:

In the following radioactive transformation given below $R$ $\xrightarrow{\alpha} X$ $\xrightarrow{\beta} Y$ $\xrightarrow{\beta} Z$; the nuclei $R$ and $Z$ are

Which of the following is not correct?

Nuclei of isotopes differ in

Successive emission of an $\alpha$-particle and two $\beta$-particles by an atom of an element results in the formation of its