Introduction to d block Flashcards
What are all of the d block elements?
All metallic, with high melting and boiling points.
Good conductors of heat and electricity
What are the transition metals?
A subset of the d block,
However these all have partially filled d orbitals
What is a complex?
A central metal ion with ligands bound to it
What is a paramagnetic compound?
compound with unpaired electrons
In what type of atoms of d block do 4s shells fill before 3d?
In neutral and gaseous atoms the 4s fills before the 3d. In ions 3d fills first
Why is stability increased with filled and half filled subshells
minimises electron electron repulsion
In metal complexes does the 4s or 3d get filled first?
3d is filled before 4s. So 4s is lost first when ionised.
What are the general trends of the d block?
Overall slight increase across rows of ionisation energies and electronegativity
Think about atomic radii of d block elements down the group
expect size to increase down, but 2nd and 3rd row are really similar.
Due to lanthanide contractions (poor shielding of f orbitals with higher effective nuclear charge means they are drawn closer towards nucleus)
What is denticity?
Number of donor atoms in the ligand that bond to the metal centre
What are ligands with one donor atom called?
Monodentate
What is a monodentate ligand?
one with one donor atom
What is a polydentate ligand?
Ligand with more than one donor atom.
What can cobalt nitrate be used to test for?
GHB
Where do d block elements have their valence electrons?
d subshell
Why are 2nd and 3rd row d block elements similar in size?
poor shielding of 4f orbitals (Lanthanide contractions)
What electrons are lost first in a metal complex?
3d is filled first so 4s is lost first
What are lanthanide contractions?
The fact that poor shielding of 4f orbitals means 2nd and 3rd row transition metals are similar in size and electronegativity
Why are 2nd and 3rd row transition metals similar in size and electronegativity?
Bc lanthanide contractions. (f orbitals poor shielding)
What is the coordination number?
The number of donor atoms coordinated to the metal centre.
What is denticity?
The number of donor atoms in a ligand that can coordinate to the metal centre. Eg monodentate-1
Whereabouts in D block do you find the biggest range of oxidation states?
The middle
Whereabouts in D block is it harder to form high oxidation states?
To the right
