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Ionic Bonds. Chemistry Mrs. Coyle. Part A:. Ions Lewis Dot Structure Stable Octet (or Duet). The Periodic Table and Atomic Radius. Valence Electrons. Valence electrons are the electrons in the highest occupied energy level of the atom.

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ionic bonds

Ionic Bonds

Chemistry

Mrs. Coyle

part a
Part A:
  • Ions
  • Lewis Dot Structure
  • Stable Octet (or Duet)
valence electrons
Valence Electrons
  • Valence electrons are the electrons in the highest occupied energy level of the atom.
  • Valence electrons are the only electrons generally involved in bond formation.
electron configuration of sodium
Electron Configuration of Sodium
  • 1s2 2s2 2p6 3s1
  • Which is the valence electron for Na?
  • Answer: 1s2 2s2 2p63s1
a positive ion cation
A Positive Ion (Cation):
  • An atom that has lost one or more electrons.
  • + charge
electron dot structure or lewis dot diagram
Electron Dot Structure or Lewis Dot Diagram

A notation showing the valence electrons surrounding the atomic symbol.

a negative ion anion
A Negative Ion (Anion)
  • An atom that has gained one or more electrons.
  • Negatively (-) charged.
when na z 11 loses its valence electron what element does its configuration look like
When Na, (Z= 11) loses its valence electron, what element does its configuration look like ?

Check your Neighbor

  • Neon
  • Potassium
  • Beryllium
  • Sodium
when na z 11 loses its valence electron what element does its configuration look like1
When Na, (Z= 11) loses its valence electron, what element does its configuration look like ?

Check your Neighbor

  • Neon
  • Potassium
  • Beryllium
  • Sodium
a stable octet
A Stable Octet

When the valence shell is full, the atom is stable, less likely to react.

Example: Noble (Inert Gases)

Kr

slide16
Note
  • Atoms tend to react in a way that would lead them to have a stable octet.
part b
Part B:
  • Equations for Formation of Ions and Naming Ions
  • Ionic Bonds and Ionic Compounds
equations for the formation of cations
Equations for the Formation of Cations

H. H+ + e-

Li. Li+ + e-

Mg: Mg2+ + 2e-

equations for the formation of anions
Equations for the Formation of Anions

. ..

: F : + e-:F -:

....

naming cations
Naming cations (+).
  • Use the name of the metal.
  • Example: Na+
  • Sodium ion.
naming anions
Naming Anions(-)
  • Use the name of the nonmetal with the ending –ide.
  • Example: F-
  • Fluoride
ionic compounds
Ionic Compounds
  • Are made up of:
    • a metal and a nonmetal ion.
    • polyatomic ions.
naming ionic compounds a first look
Naming Ionic Compounds, a First Look
  • Example: NaF
  • Sodium Fluoride
example
Example:
  • Which of the following compounds are ionic?
    • NaCl
    • CO2
    • CO
    • KF
    • KNO3
bonding
Bonding
  • Elements that do not have a complete octet, tend to react.
  • When the elements react bonds are formed.
types of bonds
Types of Bonds
  • Ionic
  • Metallic
  • Covalent
ionic bonds1
Ionic Bonds
  • Bonds that are formed by transfer of electrons from one element to the other.
  • Each element (now an ion) will have a complete octet after the transfer of electrons.
the ionic bond
The Ionic Bond

• The electrical force of attraction between oppositely charged ions.

F−

Na+

example formation of lithium fluoride
Example: Formation of Lithium Fluoride

. ..

Li. +: F : Li+:F -:

....

movie clip
Movie Clip
  • http://www.youtube.com/watch?v=Kj3o0XvhVqQ&NR=1
chemical formula
Chemical Formula
  • A representation of the kinds and number of atoms in a substance.
formula unit
Formula Unit
  • A chemical formula that shows the lowest whole number ratio of the atoms (ions) in an ionic compound.
  • Example:KCl, Mg Cl2
the formula unit is used because ionic compounds have a lattice arrangement of ions ex nacl
The formula unit is used because ionic compounds have a lattice arrangement of ions. Ex: NaCl
  • Which ball represents the Na?