How many inner shell electrons does a atom of 1s2 2s2 2p6 3s2 3p4 have ?

Particles vibrate in a rigid structure and do not move relative to their neighbors.

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

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.