Sort these six events from the earliest to the most recent. 1. democritus proposes the existence of atoms 5th 2. dalton's atomic theory 2nd 3. j. j. thomson discovers the electron 1st 4. rutherford's gold foil experiment 4th 5. bohr model 3rd 6. schrödinger's wave mechanics model of the atom 6th

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?