Statement I: Lithium needs lesser 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 less attraction from the nucleus.

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.
In Lithium, 2 electrons are present in the first orbit and the remaining electron is in the second orbit. This electron experiences less attraction from the nucleus due to the increased distance of the orbit. Also, the electrons in the first orbit repel the $3^{r d}$ electron which further reduces the net effective force on the outermost electron.
Hence it is easy to knock off the outermost electron in Lithium when compared to Helium.

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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 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.

Is it true that lithium needs less energy to knock off an electron from its outermost orbit than helium? And why?

Statement 1: If an orbit has 8 electrons, then it will be the outermost orbit of that atom.
Statement 2: The outermost orbit of the atom cannot have less than 8 electrons.

Statement 1: Hydrogen just needs 2 electrons to fill its outermost orbit.

Statement 2: The first orbit can occupy only 2 electrons.

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Statement I: Lithium needs lesser 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 less attraction from the nucleus.

Statement I: Lithium needs lesser 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 less attraction from the nucleus.