Nuclides with too many neutrons to be in the band of stability are most likely to decay by what mode

Nuclides with too many neutrons to be in the band of stability are most likely to decay by beta particle emission. A beta particle is a  high speed electron thus a particle which has high energy. This emission involves a beta ray and a neutrino from the process. With this type of emission, unstable atoms would have a more stable ratio of neutrons to protons.

There is one s orbital, and there are three p orbitals, five d orbitals, and seven f orbitals. thus, the answer is b. do not confuse the number of orbitals in a subshell with the number of electrons the subshell can hold. each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.

Use a magnet to separate iron, evaporate water, i'm not sure how to separate the other two i'm sorry but good luck