Atomic Theory
Name: ___________________________________________ Date: __________
Fill in the blanks as the information is unveiled to you.
Democritus
All matter is composed of indestructible units, called ________________________.
The ________________________ of the atom determined the characteristics.
John Dalton
All matter is made up of individual particles called atoms that cannot be __________________.
Pictured atoms of __________________ __________________.
J.J. Thomson
__________________ __________________ model.
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Entire mass is __________________ charged.
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__________________ charges are evenly distributed throughout.
Ernest Rutherford
Experiment:

Sent __________________ charged “alpha” particles through __________________ foil.

Particles all __________________ from a central point.

Why?
Concluded that the atom’s __________________ charge is all concentrated in the __________________.
Neils Bohr
Focused on __________________ in __________________ orbits.
Identified the idea of __________________ __________________.
Evidence for energy levels:

Energy __________________ or __________________ as electrons move energy levels

__________________ produced.

__________________ produced.
Erwin Schrodinger
Why did he think Bohr was incorrect?
Proposed the __________________ __________________ model, which encompasses all of the
__________________ locations of electron.
Why does the cloud have different areas of density?
Orbitals:
Recap:
1.
2.
3.

Region of space where electrons are most __________________ to be found.

All are represented in the __________________ __________________.

The __________________ the energy level, the __________________ number of orbitals.
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Each contains a maximum of __________________ electrons.