The Reaction between Sodium and Chlorine.
Chlorine has 7
electrons in its outer shell.
It is in group 7 of the periodic table.
When an atom of chlorine
it will gain one electron from sodium.
The outer shell of chlorine will then
have 8 electrons and be full.
The chloride ion will have an extra electron and
therefore an extra negative charge (shown as a - sign).
force of attraction
oppositely charged ions is called an ionic bond.
The electrons are shown as dots and crosses
to show how they have moved during the reaction.
In reality all electrons are identical.
The balanced chemical equation for the above reaction is
sodium + chlorine sodium chloride.
2Na(s) + Cl2(g) 2NaCl(s)
Sodium chloride is a crystalline
It forms a giant structure.
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