Select the molecular shape of each molecule based on the formula or Lewis structure. A molecule with the Lewis structure below has a
shape.
H-CEN:
A molecule with the Lewis structure below has a
shape.
Н
H:B:H
A molecule with the formula CBr4 has a
shape.
A molecule with the formula BeH2 has a
shape.

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.