Wave nature of an Electron

Heisenberg’s Uncertainty Principle: It is impossible to measure at the same time both the velocity and the position of an electron

Limitations of Bohr’s theory

• Worked to explain the emission spectrum of hydrogen but failed for all the other elements

• Didn’t take wave motion into account →picture of an electron travelling in a perfectly straight line cannot be true

• Heisenberg’s and Bohr’s theory were in conflict

• Didn’t take sublevels into account