It is easiest to tell if a solution is saturated if there is residue on the bottom. If it crystallized, the solution is saturated. If it is a supersaturated solution, there will not be crystallization unless more of the solute is added, at which point all of it will crystallize.
Answer: Though a hydrogen atom has only one electron, it contains a large number of shells, so when this single electron jumps from one shell to another, a photon is emitted, and the energy difference of the shells causes different wavelengths to be released... hence, mono-electronic hydrogen has many spectral lines.
Explanation: sry its late
option A Hydrogen will have the greatest rate of effusion beacuse it has the least mass among all
Pros
It doesn't cost much
Power stations are ver compact
Transportation of the material is easy
Cons
It isn't safe
Nuclear waste take 200 years to degrade
Greater risk of explosion.