Question

238 U

92 ———————>
The alpha decay of ___ produces an atom with a mass number of...
OA. 234
B. 236
C. 238
D. 240

Answer 1

A. 234

Step-by-step explanation:

An alpha particle is a Helium atom which has a mass number of 4 and atomic number of 2. So, an alpha particle decay cause the mass number to decrease by 4 units.

So 238 - 4 = 234

The answer is A