Radon-219 decays to radon-218 by a. a positron b. a muon o c. a neutron o d. an electron o e. a proton

Option (c) is the correct answer.

Explanation:

A positron is denoted as , a neutron is denoted as , an electron is denoted as , and a proton is denoted as .

Therefore, when will decay into this means there occurs decrease in its mass number. Hence, it means a neutron will be releasing during this reaction.

The reaction will be as follows.