In the following nuclear reaction,

$\mathrm{D}\stackrel{\mathrm{\alpha }}{\to }{\mathrm{D}}_1\stackrel{{\mathrm{\beta }}^{-}}{\to }{\mathrm{D}}_2\stackrel{\mathrm{\alpha }}{\to }{\mathrm{D}}_3\stackrel{\mathrm{\gamma }}{\to }{\mathrm{D}}_4$

Mass number of D is 182 and atomic number is 74 . Mass number and atomic number of D₄ respectively will be ____