Question: In the decay 2 3 4 9 0 Th AZRa + 4 2 He identify the mass number ( by balancing mass numbers ) and

In the decay 23490Th AZRa +42He identify the mass number (by balancing mass numbers) and the atomic number (by balancing atomic numbers) of the Ra nucleus.
HINT
(a)
the mass number
(b)
the atomic number

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