Ionic

1
Ionic Metallic Bonding

• Chapter 7 Notes

2
Chemical Bonds

• Hold atoms together
• Due to action of electrons
• Can be ionic, metallic, or covalent

Ionic Bond
Covalent Bond

3
Forming Ions

• Atoms gain or lose electrons to have a full octet
  (octet rule) or noble gas configuration
• Cations have a () charge Anions have a (-)
  charge
• Add the following to your periodic table.
• Group 1A 1
• Group 2A 2
• Group 3A 3
• Group 5A 3-
• Group 6A 2-
• Group 7A 1-

4
sToP tHinK

• Predict the ions that form from the following
  elements
• Sr
• S
• Al
• Mg
• K
• Cl

5
7.2 - Ionic Bonds Compounds

• Forms when electrons are transferred from a metal
  to a nonmetal
• Electrostatic force holds the cation () and
  anion (-) together
• Result is an ionic compound with a net charge
  of zero (neutrally charged)
• 3D shape is called a crystal lattice

6
Go to animation
7
sToP tHink

• An ionic compound must end up neutral - with a
  net charge of zero. How many chlorine ions would
  be needed to form a neutral ionic compound with
  an ion of each of the following?
• Na
• Mg
• K
• Ca
• Li

8
sToP tHink

• The SUBSCRIPT tells how many of each atom are
  present!
• NaCl
• MgCl2
• KCl
• CaCl2
• LiCl
• Predict How many Na with S? (First - what is the
  charge going to be on each?)

9
Properties of Ionic Compounds

• high melting points and boiling points
• Due to the 3D crystal lattice structure
• Soluble in water
• Nonconductors of electricity in solid state due
  to the limited motion of ions
• Conductors of electricity when in liquid state
  and when dissolved in water

10
7.3 - Metallic Bond Alloys

• Delocalized sea of electrons are shared by
  metal cations
• Malleable ductile because cations and electrons
  can slide past each other
• Free flowing electrons allow for electrical
  conductivity
• Alloy - homogeneous mixture of two or more metals
  or a metal and nonmetal