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jan 1, 1926 - Quantum Mechanical Model 1926

Description:

This is known as the Uncertainty Principle. The quantum mechanical model of the atom uses complex shapes of orbitals (sometimes called electron clouds), volumes of space in which there is likely to be an electron. So, this model is based on probability rather than certainty.

Added to timeline:

Date:

jan 1, 1926
Now
~ 99 years ago