Why do electrons enter the 4s orbital before entering the 3d orbital?
o a. because the 3d orbital is at a lower energy level
ob. because both the 4s and 3d orbitals are at the same energy level
o c. because the 4s orbital is at a lower energy level
od. because the 4s orbital is at a higher energy level
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In the reaction between a crushed antacid tablet and vinegar what gas is emitted

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.

Mercury turns to vapor at 629.88 k how much heat is lost 175 g of mercury vapor at 650 current condenses to a liquid at 297 ca mercury turns to weber at 629.88 kelvin how much he is lost 175 g of mercury vapor and 650 coming condensers to liquidate 297 kevin