 okay so let's look at this process of this nuclear process so already you guys should be able to tell me what kind of process it is right so this is a it's a decay yes very good it's going from one to more than okay so it's a decay yes it is a big decay but let's just figure out why it is a bigger decay okay so on this side we got 42 at 19 on this side we still got 42 as a mass number so we know whatever particle we have here is going to have a mass of 0 so from the ones we know it can either be a beta particle or a positron so a high energy electron or a positron but if we look at 20 here if we were to be a positron this should be 21 and it's not 19 so this must be a negative one and an even right so high energy electron we call it a beta particle and so we call this process beta decay okay any question about that one okay wonderful