13. What is the energy of light whose wavelength is 4.06 x 10-11 m? Use both equations for this!

if two electrons have the same n, the same ℓ, and the same ml, then they are in the same orbital. the pauli exclusion principle states that no two identical fermions (a fancy word for electrons and other subatomic particles like electrons) may occupy the same quantum state in an atom simultaneously.

pure substance: iron,copper

impure substance: water,charcoal

astronomers such as edwin hubble.