1. Draw Bohr’s Model of the following atoms:
K , P and Al
2. Label the Chemical Families
Alkali Metals, Halogens, Noble Gases, Alkali Earth
Metals, Transition Metals
K
ELECTRON CONFIGURATION :
is a shorthand description of how
electrons are arranged around the
nucleus of an atom.
Tells us which orbitals electrons
of an atom are located in.
Electron
configuration is just
a more specific
method for
identifying the
position of electrons
Orbital
s
p
d
f
shape
# of electron held
 There are 4 different orbitals that electrons
can be located in.
 Depending on how many electrons an atom
has determines the orbitals in which the
electron is located.
 Each orbital corresponds to a different shape
 s orbitals
 Sphere
 Holds 2e p orbitals
 dumbbell-shaped
 Holds 6e-
Px orbital
Pz orbital
Py orbital
all 3 p orbitals
together
 d orbitals
 Balloon shape
 Holds 10 e-
 f orbitals
Several balloons tied together
Holds 14 e-
The four orbitals
We can use the periodic table to predict which
sublevel is being filled by a particular element.
Maximum # of e-
Number of Orbitals
2
1
6
10
14
3
5
7
Now your turn
Diagram the filling of electron orbitals for
the following elements
Oxygen (O)
Potassium (K)
 The sublevel is written followed by a superscript with
the number of electrons in the sublevel.
o If the 2p sublevel contains 2 electrons, it is written 2p2
Give the identity of the element based on the
information provided:
1.Group 1A; Period 7
2.Group 5A; Period 3
3.Group 3A; Period 6
4.HIGHEST ELECTRONEGATIVITY
5.HIGHEST METALLIC CHARACTER
6.1s2 2s2 2p6 NAME THE ELEMENT
 First, determine how many electrons are in the atom.
 Arrange the energy sublevels according to increasing
energy:
 1s 2s 2p 3s 3p 4s 3d …
 Fill each sublevel with electrons until you have used all
the electrons in the atom:
 Fe: 1s2 2s2 2p6 3s2 3p6 4s2 3d 6
 The sum of the superscripts equals the atomic number
of iron (26)
practice
Phosphorous
Start with the lowest energy level and start
filling.
1s2 2s2 2p6 3s² 3p²
Add the superscripts (exponents) up and
make sure they add up to 15 electrons.
2 + 2 + 6 + 2 + 3 = 15
practice
Vanadium
Start with the lowest energy level and
start filling!
1s2 2s2 2p6 3s2 3p6 4s2 3d3
Add the subscripts
2 + 2 + 6 + 2 + 6 + 2 + 3 = 23