Why must an electron absorb a quantum of energy to move to a higher energy level?

For an electron they start at the first level (n=1) I order to move up to the next level (n=2) the amount of quantom energy to move to this next level the energy must be perfect in order to move. If the quantom energy is to small the electron it doesn't try.

gas

explanation:

hdahhd

              nitroswawdasdwasdawsdwasdwasdwasdwaswasdwasdawdswasdwadwadswadadadasd gay

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)