11/30/2016
Do Now
 Would
Electronegativity
you expect Cl to have a
large or small 1st ionization
energy?
 Why?
Electronegativity
 Electronegativity
is the ability of an
atom to attract electrons
 Electronegativity is measured using
the Pauling Electronegativity Scale
smallest possible value is 0.0
 The largest possible value is 4.0
 The
Electronegativity
is an arbitrary scale, and has
no units associated with it
 The greater the electronegativity
of an atom, the greater its ability
to attract electrons
 This
Electronegativity
 The
smallest actual value is 0.7
 Cs,
 The
F
Fr
largest actual value is 4.0
In Summary
more tightly an atom holds
onto it’s valence electrons:
 The
smaller it’s atomic radius
 The higher it’s ionization energy
 The higher it’s electronegativity
 The
1
11/30/2016
In Summary
 What
type of elements display
these properties?
 The
nonmetals!
In Summary
less tightly an atom holds
onto it’s valence electrons:
 The
larger it’s atomic radius
 The lower it’s ionization energy
 The lower it’s electronegativity
 The
In Summary
 What
type of elements display
these properties?
 The
metals!
In Summary
concept of electronegativity
will become very important when
we study chemical bonding
 The
Putting It All Together
 What
are the 4 characteristic
properties of metals?
conductors of heat/electricity
in the solid phase
 Malleable
 Ductile
 Luster
 Good
2
11/30/2016
Putting It All Together
 What
are the characteristic
properties of nonmetals?
conductors of heat/electricity
in the solid phase
 Not malleable
 Not ductile
 Doesn’t have luster
 Poor
Putting It All Together
is the most metallic metal?
 What is the most nonmetallic
nonmetal?
 What
Putting It All Together
the general ionization
energy of metals
 Describe the general ionization
energy of nonmetals
 How does the ionization energy
change as we move around the
periodic table?
 Describe
Putting It All Together
the general valence shell
electron configuration for metals
 Describe the general valence shell
electron configuration for
nonmetals
 Describe
Putting It All Together
the general atomic
radius of metals
 Describe the general atomic
radius of nonmetals
 How does the atomic radius
change as we move around the
periodic table?
 Describe
Putting It All Together
 Describe
the general
electronegativity of metals
 Describe the general
electronegativity of nonmetals
 How does the electronegativity
change as we move around the
periodic table?
3