1. Drawing Atoms
Rutherford
Bohr

2. Introducing Bohr Diagrams
What do we know about atomic theory?
Neutrons and protons are in the nucleus
Electrons are in different energy shells around the nucleus
From this we can construct Bohr diagrams
to depict what an atom looks like N P 2e 8e
Neutrons
protons
electrons
Electrons in the outermost shell are called valence electrons.

3. Bohr diagrams show how many electrons appear in each electron shell around an atom.
Hydrogen: simplest atomic structure, atomic number 1 e P
(All other atoms contain protons and neutrons in their nucleus)
Carbon: atomic number 6 N P e
Electrons in the outermost shell are called valence electrons.

4. Practice drawing Bohr diagrams
Draw the Bohr diagram for an atom with
atomic number 3, Li, Lithium 7p 7n
Draw the Bohr diagram for an atom with
atomic number 7, Ni, Nitrogen
11p
11n
Draw the Bohr diagram for an atom with
atomic number 11, Na, Sodium
How many valence electrons does each have?

5. Problems to Try Silver has an atomic number of 47 how many protons?
how many neutrons?
how many electrons?
what is the nuclear charge for this atom?
Why does silver have so many neutrons?

6. Try the Problems on your Bohr Model Diagram Worksheet