Transcript Power Point 5

Atomic Structure
Objectives 23 – 27
ORBITALS…. 
Let’s make sure we know
how far we’ve come
 The four guys who built our
understanding




Dalton (early 1800’s)
Thomson
Rutherford
Bohr
Daltons’ Models of Atoms
Carbon dioxide, CO2
Water, H2O
Methane, CH4
Thomson’s Model of the
atom
Rutherford’s Model
The experiment
Rutherford’s Experiment
The Results
Rutherford’s Model of the
Atom
Is Still Seen today
Then
Came the
Bohr
Model
Remember what Bohr
Explained?
So, what next?
What are Orbitals really?
 Definition
 Probability maps used to identify where the
electrons are most likely to be.
 Explanation
 Electrons do not travel in nice circular paths
 We don’t really know how to fully describe
the motion of an electron – it is too
complicated
 We DO know approximately where it is