The electronic configuration of A1*3 is
Answers
Answer:
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Explanation:
Your starting point here will be the electron configuration of a neutral aluminium atom,
Al
.
Aluminium is located in period 3, group 13, and has an atomic number equal to
13
. This tells you that the electron configuration of a neutral aluminium atom must account for a total of
13
electrons.
The electron configuration of the neutral atom looks like this
Al:
1
s
2
2
s
2
2
p
6
3
s
2
3
p
1
Now, when aluminium forms
3
+
cations,
Al
3
+
, it loses
3
electrons from its outermost energy shell.
In this case, the
3
electrons will come from the third energy shell. To be precise, these electrons will come from
one 3p orbital
→
1 e
−
the 3s orbital
→
2 e
−
This means that the electron configuration of the aluminium cation looks like this
∣
∣
∣
∣
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
a
a
Al
3
+
:
1
s
2
2
s
2
2
p
6
a
a
∣
∣
−−−−−−−−−−−−−−−−−−