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Standard XII
Chemistry
Multi-Electron Configurations and Orbital Diagrams
The ion that ...
Question
The ion that has different number of electrons in the ultimate and penultimate shells is :
A
N
a
+
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B
K
+
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C
C
l
−
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D
C
a
2
+
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Solution
The correct option is
B
N
a
+
The electronic configuration of ions are as follows:
N
a
+
:
1
s
2
2
s
2
2
p
6
K
+
:
1
s
2
2
s
2
2
p
6
3
s
2
3
p
6
C
l
−
:
1
s
2
2
s
2
2
p
6
3
s
2
3
p
6
C
a
2
+
:
1
s
2
2
s
2
2
p
6
3
s
2
3
p
6
The last shell is known as the ultimate shell and the shell before the last shell is the penultimate shell.
In
N
a
+
ion, the ultimate shell has 8 electrons and the penultimate shell has 2 electrons.
While in all other ions, i.e.,
K
+
,
C
l
−
,
C
a
2
+
ultimate shell has 8 electrons and penultimate shell also has 8 electrons.
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Q.
In which of the following element, both ultimate and penultimate shells are incompletely filled?
Q.
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Q.
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S
2
−
,
K
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,
C
a
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,
C
l
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contain the same number of electrons.
The increasing order of their radii is:
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