# If an atom had 200 protons, how much neutrons would it need to have to be most likely stable and why?

I know there is a specific proton/neutron ratio but i'm unaware if it applies to atoms with 86 protons and beyond.

• Such extrapolation is a moot point as nobody would be able to synthetise it. If magically succeeded, It would have t1/2 like 10^-23 s, decaying probably to 3 fractions. Apr 30 at 4:52
• BTW, it would fit better to Physics SE. Apr 30 at 4:53
• Theoretical physics states that no atom can have more than $137$ protons. Apr 30 at 9:04
• Apr 30 at 12:51
• Uh ... $10^{57}$? May 1 at 0:31