230Th+He____223Po+2 2H+-----
please complete this equation
What you have doesn't make sense to me; please clarify it.
I think the first part is
230/90Th + 4/2He but I don't know if the ________ are arrows or not. Is that a Po +2 ion? Are those 2 H^+ (as in hydrogen ions). Perhaps you intend 2H^+ to be 2 protons. And what's the significance of the difference between _____ and ------?