Zirconium (zr) has an average atomic mass of 91.22 amu and is made up of the isotopes 90zr, 91zr, 92zr, 94zr, and 96zr. the atom of which isotope has the greatest mass?

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

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.

3) in peaches, [oh]=3.16x10-11 m a) find [h+ ] b) what is the ph? c) is the solution acidic, basic, or neutral?