Give one example of a pair of elements that would be placed incorrectly if they were in the order of their relative atomic masses on the periodic table. explain why placing these two elements in the order of their relative atomic masses would not be correct.

How are isotopes of the same chemical element alike? how are they different?

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.

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit