401: a) 1: 50 protonia, 67 neutronia ja 50 elektronia 2: 30 protonia, 35 neutronia, 28 elektronia

b) 1: [[$^{194}_{\,\,78}\text{Pt}^{+4}$]] 2: [[$^{7}_{3}\text{Li}$]]

402: O-16: 0,1370 u; 127,6 MeV; 7,976 MeV
Pb-208: 1,757 u; 1636 MeV; 7,868 MeV

403: 4,2 Mt/s
404: a) 1879 MeV  b) 2025 MeV c) 145,7 MeV

406: a) [[$^{230}_{\,\,90}\text{Th}\rightarrow {^{226}_{\,\,88}\text{Ra}}+\alpha$]]

b) [[$^{35}_{16}\text{S}\rightarrow{^{35}_{17}\text{Cl}}+\text{e}+\overline{\nu}$]]

c) [[$^{13}_{\,\,7}\text{N}\rightarrow{^{13}_{\,\,6}\text{C}}+\text{e}^++\nu$]]

407: Po-210: [[$^{210}_{\,\,84}\text{Po}\rightarrow{^{206}_{\,\,82}\text{Pb}}+\alpha$]]

Pu-239: [[$^{239}_{\,\,94}\text{Pu}\rightarrow{^{235}_{\,\,92}\text{U}}+\alpha$]]

Mg-27: [[$^{27}_{12}\text{Mg}\rightarrow{^{27}_{13}\text{Al}}+\text{e}+\overline{\nu}$]]

Zr-88: [[$^{88}_{40}\text{Zr}+\text{e}\rightarrow{^{88}_{39}\text{Y}}+\nu$]]

408: a) [[$_{\,\,53}^{131}\text{I}\rightarrow{_{\,\,54}^{131}\text{Xe}}+\text{e}+\overline{\nu}$]] b) 0,9706 MeV

409: a) 5,643 MeV b) 93,93 MeV

410: a) [[$^{60}_{27}\text{Co}\rightarrow ^{60}_{28}\text{Ni}+\text{e}+\overline{\nu}$]] b) 2,828 MeV c) 1,057 pm ja 0,9305 pm

411: a) 188,9 MeV b) 76,26 TJ, samaa suuruusluokkaa
412: 37 h
413: a) 87 ng b) 65 %
414: [[$4,3\cdot 10^9\text{ a}$]]
415: 160 s
416: 190 miljoonaa