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JEE Main Chemistry Class 12 The D and F Block Elements Part 2 Questions
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Question : 20
Total: 111
Number of colourless lanthanoid ions among the following is ______.
Eu
3
+
,
Lu
3
+
,
Nd
3
+
,
La
3
+
,
Sm
3
+
[9 Apr 2024 Shift 1]
Your Answer:
Validate
Solution:
La
+
3
−
[
Xe
]
4
f
0
Nd
+
3
−
[
Xe
]
4
f
3
Sm
+
3
−
[
Xe
]
4
f
5
Eu
+
3
−
[
Xe
]
4
f
6
Lu
+
3
−
[
Xe
]
4
f
14
La
+
3
and
Lu
+
3
do not show any colour because no unpaired electron is present.
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