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Question
Write Lewis symbols for the following atoms and ions: Al and Al3+.
Solution 1
Al and Al3+
The number of valence electrons in aluminium is 3.
The Lewis dot symbol of aluminium (Al) is 
.
The tripositive charge on a species infers that it has donated its three electrons. Hence, the Lewis dot symbol is 
Solution 2
`""_13"Al"` = 2,8,3 ∴ Lewis symbol = 
, `"Al"^(3+) "ions" = ["Al"]^(3+)`.
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