Question

Which of the following particles has a mass that is almost the same as the mass of a proton?
Responses

positron
positron

neutron
neutron

beta particle
beta particle

electron

Answer 1

The particle that has a mass almost the same as the mass of a proton is the **neutron**.

To clarify the other options:
- A **positron** has a mass roughly equal to that of an electron, which is much smaller than a proton.
- A **beta particle** is essentially an electron or positron, also having a mass much smaller than a proton.
- An **electron** has a mass much smaller than that of a proton.

Therefore, the correct answer is **neutron**.