Answer:
Row 1: 12= 2 protons and 2 neutrons.
13= decreases by 2
Row 2: 14= 1 proton
15= None (I’m not sure about this one)
Row 3: 16= 1 high-energy electron
17= Increases by 1 or 2 (This one I don’t get either)
Sorry it isn’t all perfect I haven’t done this topic in ages. I hope I got it all right for you.