The expression from the post "Questions And More Questions Popping Charges" dated 07 Dec 2017,
\(\cfrac{1}{2}c^{ 2 }*{density}*3.4354\)
is valid for \(Z=1\).
As the \(\psi\) cloud increases by \(Z\), \(v^2_{max}\) increases by \(Z^2\).
Have a nice day.