2.2 Ionic Compounds

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2.2 Ionic Compounds

• 2.2.1 Atomic Ions

LO I understand how ions are formed from neutral
atoms
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Atoms form ions to achieve a stable electron
arrangement

• Metals form ions

positive

• Non-metals form ions

negative
Element Atom electron arrangement Ion electron arrangement Ion Symbol
sodium
bromine
aluminium
sulphur
2,8,1
2,8
Na
2,8,18,7
2,8,18,8
Br-
2,8,3
2,8
Al3
2,8,6
2,8,8
S2-
LO I understand how ions are formed from neutral
atoms
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2.2.2 Simple Ionic Structures
LO I understand the structure and bonding in an
ionic substance
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The ionic bond is the
attraction between positive and negative ions.
electrostatic
The structure of sodium chloride can be described
as

• An ionic .

network

• An ionic .

lattice
As the size of the ions increases the strength of
the ionic bond .
decreases
The ratio of sodium ions to chloride ions is
so the formula is .
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NaCl
LO I understand the structure and bonding in an
ionic substance