TRANSITION METALS Flashcards
What are transition metals
d block metals with incomplete d subshell
Which elements do not follow the aufbau principle
chromium and copper
When are 4s electrons lost before 3d electrons
When atoms from the FIRST ROW of the transition elements form ions
Rules for oxidation numbers?
ions containing single atoms have an oxidation number that is the same as the charge on the ion
in most of its compounds, oxygen has an oxidation number of 2 −
in most of its compounds, hydrogen has an oxidation number of 1 +
the sum of all the oxidation numbers of all the atoms in a neutral compound must add
up to zero
the sum of all the oxidation numbers of all the atoms in a polyatomic ion must be equal to the charge on the ion
What is oxidation
increase in oxidation number
Property of oxidising agents
high oxidising states
Classifications of ligands
monodentate, bidentate, tridentate… hexadentate
How to calculate coordination number
count ligands
What are the negative ions of copper and iron called
cuprate
ferrate
What is an oxidation state
allows observation of what element is being oxidised or reduced
What is a ligand
e donors that are negatively charged and will have a lone pair of e
How to name metal complexes
prefix - ligand - metal ________
Why are metal complexes coloured
incomplete 3d subshells with at least one 3d electron
Wha is crystal field theory
all 3d orbitals are degenerate and when ligands bind they are no longer degenerate
What happens if light of one colour is absorbed
its COMPLIMENTARY colour is observed
