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Question
Chemistry
The electronic configuration of gadolinium (atomic number 64) is
Q. The electronic configuration of gadolinium (atomic number
64
) is
1977
220
Classification of Elements and Periodicity in Properties
Report Error
A
[
X
e
]
4
f
3
5
d
5
6
s
2
14%
B
[
X
e
]
4
f
7
5
d
2
6
s
1
17%
C
[
X
e
]
4
f
7
5
d
1
6
s
2
51%
D
[
X
e
]
4
f
8
5
d
6
6
s
2
18%
Solution:
The electronic configuration of
L
a
(
Z
=
57
)
is
[
X
e
]
5
d
1
6
s
2
.
Therefore, further addition of electrons occurs in a lower energy
4
f
-orbital till it is exactly half filled at
E
u
(
Z
=
63
)
.
Thus, the electronic configuration of
E
u
is
[
X
e
]
4
f
7
6
s
2
.
Therefore, addition of next electron doesn't occur in a more stable exactly half-filled
4
f
7
shell but occur in a little higher energy
5
d
-orbital.
Thus, the electronic configuration of
G
d
(
Z
=
64
)
is
[
X
e
]
4
f
7
5
d
1
6
s
2