`""_(88)RA^226` के नाभिक में

Complete the following reactions. (a) ""_(88)^(226)Ra rarr alpha + (b) ""_(8)^(19)O rarr ""_(9)^(19)F + (c) ""_(13)^(25)AI rarr ""_(12)^(25)Mg+

In ""._(88)Ra^(226) nucleus there are

In ""._(88)Ra^(226) nucleus there are

When the radioactive isotope _(88)Ra^(226) decays in a series by emission of three aplha (alpha) and a beta (beta) particle, the isotope X which remains undecay is