What is critical mass?

the smallest mass of any material that can stop a chain reaction

the greatest mass of any material that can stop a chain reaction

the smallest mass of material that can sustain a chain reaction

the greatest mass of material that can sustain a chain reaction

Compare and contrast the bohr model and the electron cloud models of the atom.

One way that radioactive waste is treated is by burying it in repositories. the repositories are found only in states with very low populations. true or false? a. trueb. false(also i meant to put high school but it put down middle school instead)

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.