Can someone help with covalent bonding

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

What effect might melting sea ice have for people who live in coastal areas?

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.