Define weak force and strong force pls need it so much : ) : )

Which element is the least metallic between cadmium, silver, zinc, or iron?

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.

What does the symbol (–hfus) indicate in a phase change?