Drawing BohrRutherford
Diagrams
Steps for B-R Diagrams
Step 1
 Find the element on the periodic
table
Step 2
 Determine the number of:
 Protons
 Electrons
 Neutrons
Steps for B-R Diagrams
Step 3
 Draw the nucleus (include in the
nucleus the protons and neutrons)
Step 4
 Determine how many rings the diagram
will have (Remember: Ring # = Row #)
Steps for B-R Diagrams
Step 5
 Place the electrons in the rings
 Be sure to follow the maximum rules
Ring 1 max. = 2 electrons
Ring 2 max. = 8 electrons
Ring 3 max. = 8 electrons
Notice
that the maximum number of
electrons in a ring is equal to the number
of elements present in that row!
Filling Rules
 When
filling a ring of 8, electrons are first
placed:
 At The Top
 To
the Right
 At
the Bottom
 To
the Left
Adding the second set of electrons
 Once
the first 4 electrons have been
placed, then the electrons are paired
(using the same order)
 Top, Right, Bottom, Left
Let’s Practice: Sulfur
 Protons
=
 Electrons =
 Neutrons =
 Row # =
(# of rings)
 Element # in the row =
 (#
of electrons in outside (valence) ring
Class/Home work
 Review
pg 236
 Complete the chart of B-R
diagrams using your
Periodic Table
 Summarize patterns from
pg 238
 Complete pg 240 #1, 3, 5,
6, 8, 9