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. Options: A . &nbsp Statement I is true. Statement II is true. Statement II is the correct explanation of statement I. B . &nbsp Statement I is true. Statement II is true. Statement II is not the correct explanation of statement I. C . &nbsp Statement I is true. Statement II is false. D . &nbsp Statement I is false. Statement II is false.

Statement I: Lithium needs less energy to have an electron knocked off from it

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.

Options:

A . Statement I is true. Statement II is true. Statement II is the correct explanation of statement I.

B . Statement I is true. Statement II is true. Statement II is not the correct explanation of statement I.

C . Statement I is true. Statement II is false.

D . Statement I is false. Statement II is false.

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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