假設Isotope X of element A has 1 proton , 1 electron , 1 neutron
Isotope Y of element B has 2 protons , 2 electrons , 2 neutron
Isotope Z of element B has 2 protons , 2 electrons , 1 neutron
方法1
用方法1將一粒proton放入(X)中,成為ion of (Z)
方法2
用方法2將一粒hydrogen atom (1,1,0)與(X)結合,成為 (Y)