URGENT PLZ HELP According to AUFBAU, which of the following sublevels is of highest energy?

a) 2p

b) 3d

c) 3s

d) 4s

Which position represents spring in the southern hemisphere? a) b) c) d)

What happens to isotopes that are unstable?

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.