1) Ra-210 (alpha)
Nuclear equation
1) 88Ra 210 ===> 86Rn206 + 2He4
2) 89 Ac 227 ===> 90Th227 + e-
3) 8O15 ===> 7N15 + e+
4) 46 Pd 103 ===> 45Rh103
You have to raise or lower the atomic numbers depending on whether you emit e-, e+ or alpha particles. Atomic mass numbers do not change during e- or e+ emission or electron capture, but decrease by 4 during alpha emission.