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Byju's Answer
Standard XII
Chemistry
Periods
The Zeff ap...
Question
The
Z
e
f
f
(approx.) for
4
s
-electron of
N
i
-atom according to Slater's rule is ________.
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Solution
The configuration of Ni-atom is
1
s
2
2
s
2
2
p
6
3
s
2
3
p
6
4
s
2
3
d
8
.
Hence the
Z
e
f
f
for 4s electron
=
Z
−
S
∗
where, Z is the number of protons in the nucleus, and
S
∗
is the shielding constant.
∴
Z
e
f
f
=
28
−
(
0.35
×
1
+
0.85
×
16
+
1
×
10
)
=
28
−
23.95
=
4.05
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