Which of the following statements are true regarding variation of Zeff on valence shell electron for elements in the periodic table as per Slater's Rule.

Engineering

Chemistry

Shielding Effect and Penetration Effect

Question

Which of the following statements are true regarding variation of Z_eff on valence shell electron for elements in the periodic table as per Slater's Rule.

On moving along the period, from left to right in 3d series Z_eff increases by 0.15 without any exception.

On moving along the period from left to right Z_eff increases by 0.65 in s and p-block.

On moving along the period from left to right in inner transition elements, Z_eff remains constant.

Order of sheilding power of electron corresponds to ns > np > nd > nf.

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Slater's Rule calculates effective nuclear charge (Z_eff) as Z_eff = Z - σ, where Z is the atomic number and σ is the shielding constant.

The shielding power order is ns > np > nd > nf, as electrons in these orbitals have decreasing effectiveness at shielding outer electrons.

For s and p-block elements, moving left to right in a period, Z increases by 1, but σ increases by approximately 0.35 for each additional electron in the same shell, so Z_eff increases by about 0.65 per step.

For the 3d series, the increase in Z_eff is not a constant 0.15; exceptions exist due to electron-electron repulsion effects.

For inner transition elements (f-block), the increase in nuclear charge is nearly perfectly shielded by the addition of f-electrons in the same (n-2) shell, so Z_eff remains almost constant across the series.

Final Answer: The statements regarding the order of shielding power (ns > np > nd > nf) and the constant Z_eff for inner transition elements are true.