Can someone help me sort this :(

In apex! a liquid heated beyond a certain temperature becomes

Ill give brainiestif one neutron initiates a fission event that produces two neutrons in the products, how many new reactions can now be initiated? if each of the neutrons produced in the first fission event then initiates a fission event that produces one neutron in the products, how many new reactions can now be initiated by each neutron? how many neutrons in total were produced by the two fission events described?

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?