The number of protons, called the atomic number is shown , but the mass number is missing from the symbol above If the element has 16 neutrons what is the missing mass number ?

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?