Which of these statements correctly describes covalent bonds? a) covalent bonds are formed between a metal and a nonmetal. b) the formation of covalent bonds involves the sharing of electrons. c) two atoms that share double covalent bonds share two electrons.

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.