Ionic Bonding - the basics (GCSE)

Revision sheet for ionic bonding for the OCR 21st century science C5 course.

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  • Created on: 23-11-12 12:07
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Ionic Bonding ­ the basics
This is when atoms lose of gain electrons to make it more stable.
This then changes the atom into an ion.
Q: Why does ionic bonding happen?
A: Because atoms are trying to get a full outer shell.
Q: Why does the atom change into an ion?
A: Because an atom has no charge where as an ion has either a positive or
negative charge.
The science behind it all...
Atoms in group 1 of the periodic table only have one electron in their outer shell. As
mentioned before, to become stable ­ atoms want to have a full outer shell so the best
way to do this, for group 1 atoms, is to get rid of it. And when group 1 elements lose an
electron they form positive ions.
All the way on the other side of the periodic table, the elements in group 7 almost have a
full outer shell. Rather than lose any electrons to make them stable, they want to gain one ­
this will make the outer shell full and hence a stable atom. When group 7 gain an electron,
they form negative ions.


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