Predict the kind of decay expected, and write the nuclear equation for each of the following radioactive nuclides.

Strategy If the atomic number is greater than 83, alpha emission is observed. If the atomic number is lower, compare the mass number with the atomic mass shown in the periodic table; if the mass number is high, there are too many neutrons and one decays to a proton plus a beta particle. If the mass number is lower than the average from the periodic table, there are too few neutrons or too many protons. A proton converts to a neutron-plus positron particle, or electron capture occurs in this situation.