Among the following the incorrect statement about transition metals is
Among the following the incorrect statement about transition metals is
Cr, Mo and W have high melting points
With increase in number of unpaired electrons melting point increases
Mn3+ is more stable than Mn2+
They show variable oxidation states
The Correct Option is B
Solution and Explanation
The correct option is: (B): With increase in number of unpaired electrons melting point increases.
The atomic radii of transition metals demonstrate a rapid expansion in correspondence to a rise in atomic number due to inadequate shielding provided by the (n−1)d electrons. a) Although the electrons in the ns orbital have the first egress, they encounter filling prior to the (n−1)d orbitals. b) Owing to the deficient shielding of d electrons, an escalation in atomic number leads to an augmentation in effective nuclear charge (zeff) and a subsequent contraction in atomic radii. c) Elements in the second and third transition series exhibit nearly identical sizes because of the lanthanide contraction. d) This phenomenon stems from the weakened shielding impact generated by the 4f electrons.
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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
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