₉₂U²³⁴ has 92 protons and 238 nucleons. It decays by emitting an alpha particle

₉₂U²³⁴ has 92 protons and 238 nucleons. It decays by emitting an alpha particle and becomes

(a) ₉₂U²³⁴
(b) ₉₀Th²³⁴
(c) ₉₂U²³⁵
(d) ₉₃Np²³⁷

₉₀Th²³⁴

Emission of alpha particle, decreases the mass number by 4 and charge number by 2.

.·. Decrease in mass number = 238 – 4 = 234

Decrease in charge number = 92 – 2 = 90 ₉₀Th²³⁴ is emitted.

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