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Byju's Answer
Standard XII
Chemistry
1900's Physics and Wave
Assuming Bohr...
Question
Assuming Bohr's model for
L
i
+
+
atom, the first excitatio energy of ground state of
L
i
+
+
atom is
A
10.2 eV
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B
91.8 eV
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C
13.6 eV
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D
3.4 eV
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Solution
The correct option is
B
91.8 eV
For
L
i
+
+
model,
2
=
3
In first excitation of ground state,
n
1
=
1
and
n
2
=
2
In Bohr's model,
Δ
E
=
(
13.6
e
v
)
2
2
[
1
n
2
1
−
1
n
2
2
]
Here,
Δ
E
=
(
13.6
)
(
3
)
2
[
1
1
−
1
4
]
Δ
E
=
(
13.6
)
9
×
3
4
=
91.8
eV
So, first excitation energy for ground state in
L
i
+
+
is
91.8
eV
Option B is correct.
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