d&f Block Elements Flashcards
Improper Lattice (Typical Metal Structure)
Mn, Zn, Cd, Hg
Non Transition Metal
Zn, Cd, Hg, Cn
High MP
W
Low MP (though having more unpaired e-)
Tc, Mn
Stable E.C(Half filled) :
e- are held tightly by the nucleus so that the delocalisation is less and metallic bond is much weaker
Why 4d and 3d have similar atomic radius
Lanthanoid contraction :
The filling of 4f orbitals before 5d orbitals results in regular decrease in atomic radii due to poor shielding effect of f orbital
Highest Oxidation state
1. d block
2. 3d
1.Os, Ir (+8)
2. Mn (+7)
Amphoteric Oxide (with +2,+3 Ox. state)
CuO
ZnO - Philosopher’s wool
Cr₂O₃
Density
Ti < Zr «< Hf
Zr and Hf have same size due to Lanthanoid contraction, but Hf (5d) have higher mass than Zr (4d)
Density = Mass/Volume
High Density among d block
Os - 22.59 g/cc
Ir - 22.56 g/cc
Cu²⁺|Cu is +ve
2nd ΔᵢH is large
SRP of Zn is less -ve
High ΔₛᵤᵦH
SRP of Ni is less -ve
Less -ve ΔₕᵧₔᵣₐₜᵢₒₙH
i.e ΔₕᵧₔᵣₐₜᵢₒₙH is more
Ziegler-Natta Catalyst
(C₂H₅)₃Al + TiCl₄
Polymer preparation (High density polythene)
Atomic Radius
Eu > Yb
due to the presence of the half-filled 4f subshell
Oxidising agent - +4 ox.state
Yb, Eu, Sm
