What did henry moseley determine that contributed to understanding the atom?

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

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.

Which characteristics can be used to differentiate star systems? check all that apply.