Question

The difference between $U^{235}$ and $U^{238}$ atoms is that $U^{238}$ contains

• A. 3 more protons
• B. 3 more protons and 3 more electrons
• C. 3 more neutrons and 3 more electrons
• D. 3 more neutrons

Answer 1

The correct option is D 3 more neutrons

${}_{92}{U}^{235}{}_{92}{U}^{238}$

No. of electron = No. of proton = 92

But $U^{238}$ has 3 more neutrons more than $U^{235}$