A nuclide of an alkaline earth metal undergoes radioactive decay by emission of the periodic table to which the resulting daughter element would belong is

The radioactive isotope $${}_{27}^{60}$$Co which is used in the treatment of cancer can be made by (n.p) reaction. For this reaction the tarfet nucleus is

The radioistope, tritium ($${}_1^3$$H) has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how many milligrams of it would remain after 49.2 years?