Question

If uranium (mass no. 238 and atomic no. 92) emits $\alpha$ -particle, the product has mass number and atomic number

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

Answer 1

The correct option is A 234, 90

${}_{92}{U}^{238}{\to }_{90}T{h}^{234}{+}_{2}H{e}^4$