- Born on October 7, 1885.

- His father was a physiologist.

- He attended Copenhagen university and received a master's and doctor's degree in physics by 1911.

- His idea formed the basis of future atomic research.

- He won a Nobel prize in 1922 in physics for his work on atom structures.

- He changed Rutherford's model because he found hit that atoms give off electromagnetic radiation as a result of electrons jumping to different orbit levels.

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