Atoms And Nuclei

$\quad \frac{2}{9} \mathrm{v}_{\mathrm{B}}$

$\quad \frac{9}{4} \mathrm{v}_{\mathrm{B}}$

$\frac{4}{9} \mathrm{v}_{\mathrm{B}}$

$\frac{2}{3} \mathrm{~V}_{\mathrm{B}}$