Question

what are the energy levels? who proposed it?​

Answer 1

Answer:

Hey Buddy here's ur answer

Energy levels inside an atom are the specific energies that electrons can have when occupying specific orbitals. Electrons can be excited to higher energy levels by absorbing energy from the surroundings. Light is emitted when an electron relaxes from a high energy state to a lower one.

The notion of energy levels was proposed in 1913 by Danish physicist Niels Bohr in the Bohr theory of the atom.