Correct statement among the following is/are (i) IE 1 of T ℓ is less than I n due to its larger atomic size (ii) Diagonal relationship is shown by all elements of 2 nd and 3 rd period element (iii)

Question

Correct statement among the following is/are

(i) $IE_{1}$ of $T ℓ$ is less than $I n$ due to its larger atomic size

(ii) Diagonal relationship is shown by all elements of $2^{nd}$ and $3^{rd}$ period element

(iii) Oxygen has least magnitude value of $Δ H_{EGE}$ in its group.

(iv) $I . P_{1}$ of $P b > I . P_{1}$ of $S n$

TestHub · Accepted Answer

(i) IE₁ of Tl is greater than In due to lanthanoid contraction.

(ii) Diagonal relationship is shown by elements of 2nd period with elements of 3rd period of the next group. Not all elements show it.

(iii) Oxygen has a less negative electron gain enthalpy than sulfur due to its small size and interelectronic repulsion.

(iv) IP₁ of Pb > IP₁ of Sn due to poor shielding by 4f and 5d electrons in Pb.

Therefore, (iii) and (iv) are correct.

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