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### Video Transcript

in number 34 were just asked to find the numbers here for this radium. In this balanced equation, I'm secure. Start with biggest story, um, to 34. And it's ejecting this alfa particle here. Um, so that's four nuclear owns. So this must have 2 30 cause this balances to 30 plus four more. Gives me the 2 34 Same thing on the bottom here for the number of protons. If it says 90 in this has to this must have 88.

University of Virginia