Observe the following statements.Statement (A | vedclass

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(B) Ionisation energy is the energy required to remove an electron from an isolated gaseous atom.Ionisation potential decreases as we move down in a g

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Both $A$ and $B$ are correct.

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(B) Ionisation energy is the energy required to remove an electron from an isolated gaseous atom.Ionisation potential decreases as we move down in a group.As the atomic number increases down a group,the number of shells increases.Thus,the outermost electrons are further away from the nucleus and can be removed more easily.Hence,statement $(A)$ is correct.The outer electron in potassium $(K)$ is in the $4s$-orbital,which is further away from the nucleus than the $3s$-orbital of sodium $(Na)$.This means that less energy is needed to remove the outermost electron of potassium compared to sodium.Therefore,the first ionisation potential of sodium is greater than that of potassium.Hence,statement $(B)$ is also correct.

Observe the following statements.
Statement $(A)$: In general,the ionisation potential value decreases on moving down in the group.
Statement $(B)$: The $1$st ionisation potential of sodium is greater than that of potassium.
Correct answer is:

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Observe the following statements.Statement $(A)$: In general,the ionisation potential value decreases on moving down in the group.Statement $(B)$: The $1$st ionisation potential of sodium is greater than that of potassium.Correct answer is: