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 I is false- Statement II is false-Statement I is true- Statement II is true-Statement II is the correct explanation of statement I-Statement I is true- Statement II is true-Statement II is not the correct explanation of statement I-Statement I is true- Statement II is false-

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Stability and Octet Configuration

Statement I: ...

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

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

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Statement I is true. Statement II is false.

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Statement I is false. Statement II is false.

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Solution

The correct option is A Statement I is true. Statement II is true. Statement II is the correct explanation of statement I.
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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Similar questions

Q. 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 I: Lithium needs less energy to knock off an electron from its outermost orbit than Helium.
Statement II: Lithium has 1 electron in its outermost orbit which is loosely bound due to the repulsion of the inner orbit electrons and hence, less attraction from the nucleus.

Q. Statement I F -atom has a less negative electron affinity than Cl-atom.
Statement II Additional electrons are repelled more effectively by 3p-electrons in Cl-atom than by 2p-electrons in F-atom.

Q. Statement I The first ionisation energy of Be is greater than that of B.
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Statement I: Lithium needs less energy to knock off an electron from its outermost orbit than Helium.
Statement II: Lithium has 1 electron in its outermost orbit which is loosely bonded to the nucleus, due to the repulsion of the electrons present in the inner orbit and located at a greater distance from the nucleus.

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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 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.