Question:

$Fe^{3+}$ compounds are more stable than $Fe^{2+}$ compounds because

Updated On: Jul 6, 2022

$Fe^{3+}$ has smaller size than $Fe^{2+}$
$Fe^{3+}$ has $3d^5$ configuration (half-filled)
$Fe^{3+}$ has higher oxidation state
$Fe^{3+}$ is paramagnetic in nature

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The Correct Option is B

Solution and Explanation

$3d^5$ configuration is more stable due to singly occupied half-filled orbitals.

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List-I Alkali Metal	List-II Emission Wavelength in nm
(A) Li	(I) 589.2
(B) Na	(II) 455.5
(C) Rb	(III) 670.8
(D) Cs	(IV) 780.0

Notes on d -and f -Block Elements

Concepts Used:

D and F Block Elements

The d-block elements are placed in groups 3-12 and F-block elements with 4f and 5f orbital filled progressively. The general electronic configuration of d block elements and f- block elements are (n-1) d 1-10 ns 1-2 and (n-2) f 1-14 (n-1) d₁ ns₂ respectively. They are commonly known as transition elements because they exhibit multiple oxidation states because of the d-d transition which is possible by the availability of vacant d orbitals in these elements.

They have variable Oxidation States as well as are good catalysts because they provide a large surface area for the absorption of reaction. They show variable oxidation states to form intermediate with reactants easily. They are mostly lanthanoids and show lanthanoid contraction. Since differentiating electrons enter in an anti-penultimate f subshell. Therefore, these elements are also called inner transition elements.

Read More: The d and f block elements