Given below are two statements : one is labeled as Assertion (A) and the other is labeled as Reason (R).
Assertion: Ionisation enthalpies of early actinoids are lower than for early lanthanoids.
Reason: Electrons are entering 5f orbitals in actinoids which experience greater shielding from nuclear charge.
In the light of the above statements, choose the correct answer from the options given below :

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Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true but (R) is not the correct explanation of (A)

(A) is correct but (R) is false

(A) is false but R is true

answer is C.

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Detailed Solution

The energy difference between 7s and 5f is less than 6s and 4f.

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