Identify the element that contains 87 electrons

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

The nuclear fission process releases neutrons and question 27 options: alpha particles electrons energy beta particles

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?