1. the total number of protons
2. the number of protons in the atom changes
3. the spontaneous emission of radiation
4. mashing two marshmallows together
5. There must be a way for unstable nuclei to become stable nuclei.
6. The nuclei combine in a fusion reaction.
7. The nucleus with the greatest positive charge is on the right side of the reaction.
8. A nucleus with a large mass will be on the left side, and there will be neutrons in the equation.
9. Atoms are split into smaller pieces during fission.
10. A neutral particle is striking a positive particle, breaking it into more neutral and positive particles.
11. An unstable nucleus releases a particle containing two protons and two neutrons.
12. gamma decay
13. helium
14. After the ejection of an alpha particle, the remaining nucleus has a mass number that is four less and an atomic number that is two less, so alpha decay is a type of nuclear fission.
15. Beta decay releases a particle, while gamma decay only reduces the energy level. Neither beta decay nor gamma decay is a form of nuclear fission.
16. essay (the equation is balanced)
17. essay
18. essay (model is beta plus decay, not beta minus)
not sure if the essay question tips are right, mine hasnt been graded yet