Oxide ions are also formed when aluminium oxide is dissolved. What is the formula of an oxide ion?
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Oxygen,
Z
=
8
, commonly forms the oxide ion,
O
2
−
.
Explanation:
We would have got the same formalism had we considered the formula of
A
l
2
O
3
, given that we know that aluminum commonly forms an
A
l
3
+
cation. Molten alumina is used in the preparation of aluminum metal; see this site for details.
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