Question

The radioactive isotope Uranium-235 has a difference of ________________________ in comparison to Uranium-238.

A) 3 less Neutrons
B) 3 Less Protons
C) 3 Less Electrons
D) No mass change, only a change in charge

Answer 1

Answer:

A) 3 less Neutrons

Explanation:

Uranium - 235 and Uranium - 238 have the same amount of protons because they are the same element: 92 protons.

However, U - 235 has 143 neutrons while U - 238 has 146 neutrons. U - 238 has a mass of 3 neutrons more.