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Ionic Bonding. Specification. Candidates should be able to: (a) describe the term ionic bonding as electrostatic attraction between oppositely charged ions; (b) construct ‘dot-and-cross’ diagrams, to describe ionic bonding;

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specification
Specification
  • Candidates should be able to:

(a) describe the term ionic bonding as electrostatic attraction between oppositely chargedions;

(b) construct ‘dot-and-cross’ diagrams, to describe ionic bonding;

(c) predict ionic charge from the position of an element in the Periodic Table;

(d) state the formulae for the following ions: NO3, CO32–,SO42– and NH4+;

lesson objectives
Lesson Objectives
  • Know the difference between an ion and an atom
  • Describe the term ionic bond as electrostatic attraction between oppositely charged electrons
  • Draw cross and dot diagrams for given compounds
  • Draw the bonding in given polyatomic ions and state their overall charge
describe the term ionic bonding as electrostatic attraction between oppositely charged ions
describe the term ionic bonding as electrostatic attraction between oppositely charged ions;
  • What is an ion?
    • Ions are formed when one atom transfers electrons from one atom to another
    • Electrons can be gained or lost
    • They generally do this in order to form a full outer shell
slide6

An oxygen atom has the electron structure 2,6. It needs to gain 2 electrons in its outer shell to become stable.

lesson objectives1
Lesson Objectives
  • Lesson Objective 1- know the difference between an atom and an ion
using the whiteboards periodic tables predict what ions would be formed by the following
Using the whiteboards + Periodic tables predict what ions would be formed by the following
  • Calcium
  • Nitrogen
  • Flourine
  • Potassium
  • Bromine
  • Oxygen
ionisation equations
Ionisation equations
  • Ca → Ca2+ + 2e-
  • N + 3e- → 3N-
  • Write down the equations for F,K,Br and O
electrostatic attraction
Electrostatic Attraction
  • This donation of electrons creates a positive and a negative ion
  • Because positives attract negatives a bond is formed
  • This bond is an electrostatic attraction or ionic bond
lesson objectives2
Lesson Objectives
  • Lesson Objective 2-Describe the term ionic bond as electrostatic attraction between oppositely charged electrons
slide15

An oxygen atom has the electron structure 2,6. It needs to gain 2 electrons in its outer shell to become stable.

slide16

Aluminium

Oxygen

To work out the number of ions of each element we need to balance the number of electrons being given and taken.

2 x 3= 6 electrons from the aluminium and

3 x 2 = 6 electrons to the oxygen

2-

3+

2-

3+

2-

The formula is Al2O3

questions
Questions

Draw dot and cross diagrams for the following

  • LiF
  • Na2O
  • MgO
  • AlCl3
  • MgCl2
polyatomic ions
Polyatomic ions
  • Poly-many
  • Atomic-atoms
  • E.g. hydroxide OH-(draw on board)
lesson objectives3
Lesson Objectives

Lesson Objective 3 Draw cross and dot diagrams for given compounds

extension activity
Extension Activity
  • Draw cross and dot diagrams to show the structures of the following NO3-, CO32–, SO42– and NH4+
  • Predict the charge on the following polyatomic ions ClO (chlorate), PO4 (phosphate), MnO4 (permanganate) and S2O3 (thiosulphate)
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