Use the equation to complete the activity.

21986
Rn + Beta→ 21985
Asmass of beta is zero, and it is an electron
mass of beta is zero, and it is an electron

mass number is zero, it is a proton
mass number is zero, it is a proton

mass number is zero, it is a gamma.
mass number is zero, it is a gamma.

mass number is zero, and it is a neutron