The radionucleide ₉₀²³⁴Th undergoes two successive β -decays followed by one α -decay. The atomic number and the mass number respectively of the resulting radionucleide are

Nuclear Chemistry (historical): JEE Main 2003 Chemistry question

JEE Main 2003 · Annual, Paper 1 · Q480

JEE Main 2003Annual, Paper 1ChemistryEasyNuclear Chemistry (historical)9× since 2002

The radionucleide

{}_{90}^{234}Th

undergoes two successive

\beta

-decays followed by one

\alpha

-decay. The atomic number and the mass number respectively of the resulting radionucleide are