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Slide 1

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What are we learning today...
Formulae of ionic
1. To state the formula of an ionic compound when
its ions are given.
2. To determine the formula of ionic compounds that
include brackets in the formula.
Key Words: Overall charge.…read more

Slide 2

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Group activity Starter
In your groups, draw the electronic structure of the
following atoms:
Lithium Beryllium Oxygen Fluorine
Sodium Magnesium Sulfur Chlorine
Potassium Calcium
5 mins
*…read more

Slide 3

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Class discussion L.O 1
The overall charge on any ionic compound is zero. The
compounds are neutral.
The charges on the ions in a compound cancel out:
Ionic compound Ratio of ions in Formula of
compound compound
sodium chloride Na+ : Cl- NaCl
magnesium oxide Mg2+ : O2- MgO
calcium chloride Ca2+ : Cl- CaCl2
1:2…read more

Slide 4

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Class discussion L.O 1
Groups of metals
· The atoms of Group 1 elements form 1+ ions, eg. Li+
· The atoms of Group 2 elements form 2+ ions, eg. Ca2+
Groups of non-metals
· The atoms of Group 7 elements form 1- ions, eg. F-
· The atoms of Group 6 elements form 2- ions, eg. S2-…read more

Slide 5

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Individually Task
1) What is the overall charge on an ionic compound?
2) What is the formula of magnesium chloride?
3) What is the formula of lithium sulfide?
Extension: What is the formula of iron(iii) oxide?
1) 0
2) MgCl2
3) Li2S
Extension: Fe2O3
5 mins…read more

Slide 6

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Class discussion L.O 2
The names of compounds of transition metals contain the
charge on their ions in brackets in roman numerals.
This is because they can form ions carrying different sizes of
positive charge. eg. Iron can form 2+ and 3+ ions.
So the name iron(iii) oxide tells us that the iron is present as
Fe3+ ions in this compound.
*…read more

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