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WAEC Chemistry 2012 Paper
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© africaexams.com
Question : 3
Total: 44
Which of the following ions has an electron configuration different from the other?
17
CI
-
8
O
2-
12
Mg
2+
13
AI
3+
Validate
Solution:
17
Cl
−
= 18 electrons = 2, 8, 8
12
Mg
2
+
,
8
O
2
−
and
13
Al
3
+
all have 10 electrons = 2, 8.
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