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13.Nuclei
medium
A radioactive nucleus ${ }_{\mathrm{Z}}^{\mathrm{A}} \mathrm{X}$ undergoes spontaneous decay in the sequence
${ }_{\mathrm{Z}}^{\mathrm{A}} \mathrm{X} \rightarrow {}_{\mathrm{Z}-1}{\mathrm{B}} \rightarrow {}_{\mathrm{Z}-3 }\mathrm{C} \rightarrow {}_{\mathrm{Z}-2} \mathrm{D}$, where $\mathrm{Z}$ is the atomic number of element $X.$ The possible decay particles in the sequence are :
A
$\alpha, \beta^{-}, \beta^{+}$
B
$\alpha, \beta^{+}, \beta^{-}$
C
$\beta^{+}, \alpha, \beta^{-}$
D
$\beta^{-}, \alpha, \beta^{+}$
(NEET-2021)
Solution
$\beta^{+}$decreases atomic number by $1$
$\alpha$ decreases atomic number by $2$
$\beta^{-}$increases atomic number by $1$
Standard 12
Physics
