# NEET Physics Nuclei Questions Solved

A radioactive nucleus undergoes a series of decay according to the scheme
$\mathrm{A}\stackrel{\mathrm{\alpha }}{\to }{\mathrm{A}}_{1}\stackrel{\mathrm{\beta }}{\to }{\mathrm{A}}_{2}\stackrel{\mathrm{\alpha }}{\to }{\mathrm{A}}_{3}\stackrel{\mathrm{\gamma }}{\to }{\mathrm{A}}_{4}$
If the mass number and atomic number of A are 180 and 72
respectively, then what are these number for ${\mathrm{A}}_{4}$

(a) 172 and 69        (b) 174 and 70
(c) 176 and 69        (d) 176 and 70