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20h 19min, dec 31, 1912 y - Niel Bohr (copy) (copy) (copy) (copy) (copy) (copy) (copy) (copy) (copy) (copy) (copy) (copy) (copy) (copy)

Description:

Proposed hydrogen atom theory

Added to timeline:

30 Jan 2018
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Date:

20h 19min, dec 31, 1912 y
Now
~ 111 years ago
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