They come in many different shapes and sizes what rock is it sedimentary igneous metamorphic

Which of these best describes an ionic bond?

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.

Is 9 correct? and can someone me with 10? it’s due tomorrow, you