Read the passage and answer the question.

Experiments performed have showed that radioactivity is a nuclear phenomenon in which an unstable nucleus undergoes a decay. This is referred to as radioactive decay. Three types of radioactive decay occur in nature :

1. α-decay
2. β-decay
3. γ-decay

 Consider that ₉₂U²³⁸ decays via alpha decay. 

What is the number of nucleons in the daughter nuclei?

234

Number of nucleons = mass number

In alpha decay, mass number decreases by 4.

Therefore, no. of nucleons = 238-4=234