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KS3 Science - Atomic History Timeline: Bohr

How ideas about the atom developed - evolution of the atomic model

Niels Bohr (1885 - 1962)

Niels Bohr was born and educated in Copenhagen, Denmark. He lived, worked, and died there, too. But his mark on science and history was worldwide. 

After receiving his doctorate in 1911, Bohr traveled to England on a study grant and worked under J.J. Thomson, who had discovered the electron 15 years earlier. Read more HERE

Read more about Bohr's theory

After Bohr's theory - Quantum Model

Bohr's Atomic model

Main points 

** Explains role of electrons in bonding

** Ionic and covalent bonding explained

** Places electrons in definite energy levels

The Bohr model of the atom, a radical departure from earlier, classical descriptions, was the first that incorporated quantum theory and was the predecessor of wholly quantum-mechanical models. The Bohr model and all of its successors describe the properties of atomic electrons in terms of a set of allowed (possible) values.

source: http://www.britannica.com/EBchecked/topic/71700/Bohr-atomic-model

Watch a video - wave nature of electrons

Drawbacks of Bohr's model

Shapes of molecules and other abnormalities not explained