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KS4 Chemistry. Ionic Bonding. Full electron shells. 2 nd shell holds a maximum of 8 electrons. 1 st shell holds a maximum of 2 electrons. 3 rd shell holds a maximum of 8 electrons.

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Ks4 chemistry

KS4 Chemistry

Ionic Bonding


Full electron shells
Full electron shells

2nd shell holdsa maximum of8 electrons

1st shell holdsa maximum of2 electrons

3rd shell holdsa maximum of8 electrons

Atoms of noble gases, group 8, have completely full outer shells. This makes them very unreactive or stable.


Atoms and electron changes
Atoms and electron changes

Every atom would like to have a full outer shell like the noble gases.

Atoms can get full outer electron shells by either gaining or losing electrons


From atoms to ions
From atoms to ions

How can reactive metal atoms become stable positive ions?


Bonding example 1
Bonding: example 1

Making sodium chloride – table salt!!!


What would a chlorine atom have to do to have a stable electron configuration like a noble gas?

It will have to gain an electron!!!


What would a sodium atom have to do to have a stable electron configuration like a noble gas?

It will have to lose an electron!!!



Sodium gives an electron to chlorine!!! and sodium could lose an electron?




Key definitions
Key definitions ionic bond!!

An ionic bond is formed when ions that have opposite charges attract



Ionic lattices
Ionic lattices ionic bond!!

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In an ionic compound, millions and millions of ions are packed all joined by ionic bonds

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Bonding example 2
Bonding example 2 ionic bond!!

Making Magnesium oxide



O shell?

What would oxygen need to do to get a stable full outer shell?


Can you think of a way that magnesium could lose two electrons and oxygen could gain two electrons
Can you think of a way that Magnesium could lose two electrons and oxygen could gain two electrons?

O

Mg

Magnesium gives two electrons to oxygen!


Once this happens the magnesium and oxygen atoms each get charge and become ions of opposite charge
Once this happens the Magnesium and Oxygen atoms each get charge and become ions of opposite charge

2+

2-

O

Mg

[2.8]2+

[2.8]2-

2.8.2

2.6


Magnesium oxide part 2
Magnesium oxide: part 2 get charge and become ions of opposite charge

O

Mg

The positive magnesium ions and the negative oxygen ions are strongly attracted to each other and form an ionic bond.

-2

+2


Ionic lattices1
Ionic lattices get charge and become ions of opposite charge

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In an ionic compound, millions and millions of ions are packed together in a regular cubic arrangement, joined by ionic bonds..

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Formation of an ionic bond1
Formation of an ionic bond get charge and become ions of opposite charge


Multiple choice quiz
Multiple-choice quiz get charge and become ions of opposite charge


Compounds
Compounds get charge and become ions of opposite charge

H

O

H

Compounds are made up of two OR MORE different elements chemically combined

Example: water – H20

Others compounds, like DNA, have large, complex structures containing thousands or even millions of bonded atoms.


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