Atomic Structure Objectives 23 – 27 ORBITALS…. 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, CO 2 Water, H 2 O Methane, CH 4

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