Blackline Master 5.4-1
Name:
Date:
Bohr–Rutherford Diagrams
Answer the following questions using the procedure given in question 1 below.
1. (a) Draw a nucleus with the correct number protons and neutrons for the element
oxygen(O-16).
(b) Draw the first orbit level.Fill in up to two electrons.If there are two electrons in
the first orbit, they must be paired. Go to step (e) if you run out of electrons.
(c) Draw the second orbit level.Fill in up to eight electrons.Fill the orbit with pairs
of electrons.If the number of electrons for the levelis odd, draw pairs until there
is only one electron left; this electron will be unpaired. Go to step (e) if you run
out of electrons.
(d) Draw the third orbit level.Fill in up to eight electrons.Fill the orbit with pairs of
electrons.If the number of electrons for the levelis odd, draw pairs until there is
only one electron left; this electron will be unpaired. Go to step (e) if you run out
of electrons.
(e) Count the number of electrons in the outer orbit level.How many are there?
2. Draw a Bohr–Rutherford diagram for sulfur (S-32). How many electrons are in the
outer orbit level?
Copyright © 2010 by Nelson Education Ltd.
Chapter 5 Blackline Master 5.4-1
475
Blackline Master 5.4-1
Name:
Date:
Bohr–Rutherford Diagrams (continued)
3. Draw a Bohr–Rutherford diagram for each element below, and list the number of
electrons in the outer orbit level.
(a) chlorine (Cl-35)
(b) calcium (Ca-40)
4. Identify the trend within each period and within each group.
5. Predict the number of outermost electrons in the following elements:
(a) bromine, Br
(b) cesium, Cs
(c) tin, Sn
(d) arsenic, As
6. Compare the number of orbits to the period number. What do you conclude?
476
Chapter 5 Blackline Master 5.4-1
Copyright © 2010 by Nelson Education Ltd.