# Question #ac708

May 10, 2017

Both A and C.

#### Explanation:

Beta minus decay occurs when a neutron decays into a proton, electron, and antineutrino. So the atomic number increases by one.

Beta plus decay occurs when a proton decays into a neutron, positron, and a neutrino. So the atomic number decreases by one.

May 10, 2017

C.

#### Explanation:

Let's say the radioactive isotope is Y and the new element formed is Z. If a beta particle (e) is released it would look something like this:

¹₀Y → ₋₁⁰e + ¹₁Z

So atomic number increases by 1 but mass number is unchanged.