Complete the sentence. select all that apply. the emission of a beta particle has the effect of: decreasing mass by one unit increasing mass by one unit no change in mass adding a proton to the nucleus adding a proton of zero mass to the nucleus

Answer is: adding a proton to the nucleus.

Beta decay is radioactive decay in which a beta ray and a neutrino are emitted from an atomic nucleus.  

There are two types of beta decay: beta minus and beta plus.  

In beta plus decay, a proton is converted to a neutron, positron and an electron neutrino, so mass number does not change.

In beta minus decay (atomic number Z is increased by one) neutron is converted to a proton and an electron and an electron antineutrino.

For example, nuclear reaction:

²⁶Na → ²⁶Mg + e⁻(electron) + ve(electron antineutrino

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