Question
Statement I: Lithium needs less energy to have an electron knocked off from its outermost orbit than does helium.
Statement II: Lithium has one electron in its outermost orbit which is loosely bound due to the repulsion of the inner orbit electrons.
Statement II: Lithium has one electron in its outermost orbit which is loosely bound due to the repulsion of the inner orbit electrons.
Answer: Option A
:
A
The electronic configuration of Li is as follows -
K
L
2
1
The electron present in L shell experiences less attraction from the nucleus due to the increased distance of the shell. Also, it experiences repulsion from the electrons present in K shell. This further reduces the net effective nuclear force on it.
Hence, it is easier to knock off the outermost electron in lithium as compared to helium.
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:
A
The electronic configuration of Li is as follows -
K
L
2
1
The electron present in L shell experiences less attraction from the nucleus due to the increased distance of the shell. Also, it experiences repulsion from the electrons present in K shell. This further reduces the net effective nuclear force on it.
Hence, it is easier to knock off the outermost electron in lithium as compared to helium.
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