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In the decay 234 90 Th A Z Ra+ 4 2 Heidentify the mass number (by balancing mass numbers) and the atomic number (by balancing

In the decay²³⁴₉₀Th ^A_ZRa+⁴₂Heidentify the mass number (by balancing mass numbers) and the atomic number (by balancing atomic numbers) of theRanucleus.

(a)the mass number

(b)the atomic number

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