1. The problem statement, all variables and given/known data Complete the following decay equations by inserting the missing particle or nuclide information. Identify each type of decay. i) 90?Sr = ?39Y + ? + ? ii) 22?Na = ??Ne + β+ + ? + energy iii)24294Pu = ??? + alpha + ? iv) 235?U = 91?Sr + 141?Xe + ? v) 0-1e + 0+1e → ? 3. The attempt at a solution i) 9038Sr = 8939Y + β- + ? this is beta decay. - note, lost 1 nucleon. is this ? just 1n? ii) 2211Na = 2010Ne + β+ + ? + energy also beta decay - note, lost 2 nucleons. is this ? just 21n? iii) 24294Pu = 23892U + alpha + ? alpha decay iv) 23592U = 9138Sr + 14154Xe + ? fission? v) i have no idea. - Just looking at that, there seems to be an extra ? for each decay equation. in my text throughout theres only the decay pronumeral in the products, not something extra as well. so im not really sure what is meant to go in there? - Also im not sure about the relevance of the energy is ii) since all of these decays emit energy anyway. - iv) doesnt look to be any kind of decay, it seems to represent fission. which would make that '?' 31n? - and v) i have no idea what the result of an electron positron bond is.