what is the electronic configuration of iron?
Answers
Your Answer is:
[Ar]3d6 4s2
Hope this will help you.
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on the fourth row of the periodic table, sixth column of the transition metals, atomic number
26
.
What we have is:
Its core orbitals are the
1
s
,
2
s
,
2
p
's,
3
s
, and
3
p
's.
Its valence orbitals are the
4
s
and
3
d
's.
Writing the electron configuration, you really only need the valence orbitals, and you can omit the core orbitals by notating it via the noble gas shortcut.
So,
[
A
r
]
can be written instead of
1
s
2
2
s
2
2
p
6
3
s
2
3
p
6
.
Note that the total number of electrons in the neutral atom adds up to the atomic number, so
2
+
2
+
6
+
2
+
6
=
18
, which is the atomic number of
Ar
.
Finally, the
4
s
orbitals are higher in energy than the
3
d
orbitals by about
3.75 eV
when they are partially filled like this, so we write the
3
d
before the
4
s
.
Therefore, we get:
[Ar]3d64s2
r
]
3
d
6
4
s
2