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.

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

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

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Statement I is true. Statement II is false.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Statement I is false. Statement II is false.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

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.

Suggest Corrections

Similar questions

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.
Statement II 2p-orbital is lower in energy than 2s (J2000, (s), 1M)

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.

Statement - I: $C d$ is a transition element.
Statement - II: $C d$ and $C d^{2 +}$ both have completely filled $d -$ orbitals in their ground state.

Join BYJU'S Learning Program

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.