Question

If uranium (mass number 238 and atomic number 92) emits an $\alpha -$ particle, the product has mass number and atomic number:

• A. 236 and 92
• B. 234 and 90
• C. 238 and 90
• D. 236 and 90

Answer 1

The correct option is B 234 and 90

The nuclear reaction is
${}_{92}{U}^{238}{\to }_{2}H{e}^4\left(\alpha \right){+}_{90}T{h}^{234}$