Hello Anya!
This is a question about a fusion reaction. I can tell because there is no chemical reaction causing this change, the reaction is entirely within the nucleus. I can also tell because after the reaction there is only one nucleus left over--and fusion reactions make smaller nuclei into bigger nuclei.
Since we're not given any information about alpha or beta information, this question is easy! The left side of the equation has an unknown nucleus, 98 protons, and 196 neutrons (Do you see how I know there are 196 neutrons?). The right side of the equation has 118 protons, 176 neutrons in the UUO nucleus, and 3 protons left over. So let's select an unknown nucleus that balances the equation.
Happy to talk more, if you'd like!
