Which atom in the ground state has the same electron configuration as a calcium ion, ca2+, in the ground state? (1) ar(2) k(3) mg(4) ne

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.

Who discovered a pattern to the elements in 1869?

What are the trends and exceptions to the trends in electron affinity?