1.

Three \[\alpha -\]particles and one \[\beta -\]particle decaying takes place in series from an isotope \[_{88}R{{a}^{238}}\]. Finally the isotope obtained will be                                                          [CPMT 1989; DCE 2000]

A.            \[_{84}{{X}^{220}}\]          
B.            \[_{86}{{X}^{222}}\]
C.            \[_{83}{{X}^{224}}\]          
D.            \[_{83}{{X}^{215}}\]
Answer» D.            \[_{83}{{X}^{215}}\]


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