Which of the following pairs are isotpes? A) H-3 & He-4
B) Mg with 12 protons & Na with 12 neutons
C) Al-27 & Co with 27 protons
D) O-16 & O-18

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.

Which organism develops breathing organism develops breathing organs from pharyngeal arches? shark, spider, sea star, sea horse

What are the coefficients to balance the following equation? ba+br2=babr2