The element will break down because the extremely high proton to neutron ratios make the nucleus become unstable.
In a stable nucleus, the number of protons and neutrons is equal. When the number of neutron increase or decrease, this disbalances the nuclear force that makes the nucleus stable.
This is utilized to make artificial radioactive isotopes of elements for medical and industrial use. In this method, scientists bombard the nucleus with neutrons.
Therefore, the nucleus with 50 protons and 90 neutrons will be broken down.
To know more about Elements,
https://brainly.com/question/2416390?
