Chemistry > d and f Block Elements > 3.0 General Trends in properties of First Row Elements
d and f Block Elements
1.0 General Introduction and Electronic Configuration
2.0 Occurrence and General Characteristics of Transition Elements
3.0 General Trends in properties of First Row Elements
3.1 Ionisation Enthalpy
3.2 Oxidation State
3.3 Atomic and Ionic Radii
3.4 Colour
3.5 Catalytic properties
3.6 Magnetic Properties
3.7 Formation of Interstitial Compounds
3.8 Alloy Formation
4.0 Potassium dichromate
5.0 Potassium permanganate
5.1 Properties of potassium permanganate
5.2 Structure of manganate ion and permanganate ion
5.3 Disproportion of an oxidation state
5.4 Uses
6.0 F-Block Elements - Introduction
7.0 Lanthanoid Series
7.1 Position of Lanthanoid Series
7.2 Electronic configuration of lanthanoids
7.3 Oxidation States
7.4 Chemical Reactivity of Lanthanides
8.0 Lanthanoid Contraction and its consequence
9.0 Actinoids Series
9.1 Position of Actinoids in periodic table
9.2 Electronic Configuration of actinoids
9.3 Oxidation states of actinoids
10.0 Comparison between lanthanoids and actinoids
3.7 Formation of Interstitial Compounds
3.2 Oxidation State
3.3 Atomic and Ionic Radii
3.4 Colour
3.5 Catalytic properties
3.6 Magnetic Properties
3.7 Formation of Interstitial Compounds
3.8 Alloy Formation
5.2 Structure of manganate ion and permanganate ion
5.3 Disproportion of an oxidation state
5.4 Uses
7.2 Electronic configuration of lanthanoids
7.3 Oxidation States
7.4 Chemical Reactivity of Lanthanides
9.2 Electronic Configuration of actinoids
9.3 Oxidation states of actinoids
- Crystal lattice of transition metals have interstitial spaces.
- The interstitial spaces in these lattice of transition metals are occupied by small non-metals such as $H$, $B$, $C$, $N$ etc. and form interstitial compounds.
- They does not follow definite composition and neither ionic or covalent character hence they are non stoichiometric in nature.
- Ex. $TiC$, $Ti{H_{1.73}}$, $M{n_4}H$, $F{e_3}H$, $V{H_{0.56}}$, $Zr{H_{1.92}}$, etc.
Some characteristic properties of interstitial compounds are
- They have identical chemical properties with their parent metals.
- These are hard, lustrous and have electrical and thermal conductivity.
- Their melting points are higher than parent metal because the metal - nonmetal bonds are stronger than metal-metal bond.
- They are higher than pure metals.
- Hydrides of these elements are used as reducing agents.
- Metallic carbides are chemically inert and very hard as diamond.
- Steel and cast iron are the interstitial compounds of $Fe$ and $C$ which are harder than $Fe$ and have very hard bridges like diamond.
