Storing Heavy Elements, Where It Get Larger

From the post "Temperature, Space Density And Gravity",

If an electron collide into the nucleus,

$r_o=\cfrac{q^2}{4\pi \varepsilon_o{m_ec^2}}<r_{n}$

where $r_{n}$ is the radius of the positive nucleus.

We see that as  $c$  increases in less dense space  $r_o$,  the orbital radius of electron decreases and it might clash into the nucleus and annihilate with a positive charge there in a matter/antimatter fashion.

This suggests that heavier elements of larger  $r_n$, nucleus radius,  is less stable from such possible collisions.  It also suggest that if we are able to pump space into a containment and make space inside denser  ($c$  decreases),  heavy elements in it will be more stable.

And oddly, in denser space, atoms are larger because of greater electron orbits.