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Byju's Answer
Standard XII
Chemistry
Multi-Electron Configurations and Orbital Diagrams
If first ioni...
Question
If first ionisation energy of hydrogen is
E
, then the ionisation energy of
H
e
+
would be:
A
E
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B
2
E
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C
0.5
E
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D
4
E
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Solution
The correct option is
D
4
E
I
E
=
E
z
2
n
2
=
0
i.e for hydrogen
z
=
1
∴
I
.
E
=
E
For helium,
z
=
2
and for first ionization the value of n=1.
I
.
E
=
E
z
2
=
E
(
2
)
2
=
4
E
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