Limitations of Bohr Model

C) Limitations of Bohr Model

1) electron couldn’t circle around nucleus like a planet! …

Because they would lose energy (by emitting electromagnetic radiation) & spiral into nucleus.

2) Bohr was not able to explain electron orbits of large atom w/ many electrons

Uncertainty Principle

When you are studying sub-atomic particles, you change them.
(A particles position and momentum are affected by your measuring devices. )

You can be certain about the position or momentum of a subatomic particle but never both at the same time.

The more know about the momentum of a subatomic particle, the less you know about its position and vice versa

Present Theory of the Atom
- Cloud Model

Electrons do not have precisely described positions and momenta

The 'probable' position and momenta are described mathematically

Electrons occupy regions in space called 'clouds'.

Enrichment