the nucleus of a 125 xe atom
The nucleus of a Xe 125 atom (an isotope of the element xenon with mass 125 u) is 6.0 fm in diameter. It has 54 protons and charge q= +54e.he nucleus of a Xe 125 atom (an isotope of the element xenon with mass 125 u) is 6.0 fm in diameter. It has 54 protons and charge q= +54e.