If 72.4 kJ of heat is applied to a 952 g block of metal, the temperature of the metal goes up 10.7°C. What is the
specific heat of the metal in J/gºC ?

indium, and thallium have three electrons i think

answer: gold foil experiment - he shot alpha particles at a gold foil

explanation:

it is the minimum amount of material needed to sustain a fission reaction.

critical mass is the minimum amount of fissionable material that must be assembled for a sustained fission reaction to take place. although two to three neutrons are produced for every fission, not all of these neutrons are available for continuing the fission reaction. if the conditions are such that the neutrons are lost at a faster rate than they are formed by fission, the chain reaction will not be self-sustaining.   at the point where the chain reaction can become self-sustaining, this is referred to as critical mass.