1Which of these is a radioactive element? uranium, plutonium, thorium, or all of these?
2Fill in the blank: The process in which the unstable nucleus of an element with a large atomic number splits into smaller atoms is called ............
3Give a reason: Atomic energy is both beneficial and harmful.
4What is radioactive emission? How many types are there?
5Write short notes on nuclear fission and nuclear fusion.
6Why does a nucleus become more unstable as the atomic number increases?
7How is electricity produced in a nuclear reactor?
8Why can people not obtain energy from nuclear fusion artificially?
9Where does the energy in nuclear fission come from?