General Properties Of The Transition Elements
Chapter Name : The D- And F- Block Elements |
Sub Topic Code : 102_12_08_03_12 |
Topic Name : General Properties Of The Transition Elements |
|
Sub Topic Name : Formation Of Interstitial Compounds |
|
Introduction
•
Interstitial compounds are those which are formed when
small atoms like H, C or N are trapped inside the crystal lattices of metals.
•
They are usually non stoichiometric and are neither
typically ionic nor covalent,
• Example: TiC, Mn4N,
Fe3H, VH0.56 and TiH1.7, etc
•
The formulas quoted do not, of course, correspond to
any normal oxidation state of the metal. Because of the nature of their
composition, these compounds are referred to as interstitial compounds.
•
The main physical and chemical characteristics of
these compounds are as follows:
•
(i) They have high melting points, higher than those
of pure metals.
(ii) They are very
hard, some borides approach diamond in hardness.
Pre-Requisites:
Periodic table, elements
Activity:
Various precious metals such as silver, gold and
platinum and industrially important
Real Life Question:
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Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Group | Group is the vertical column on the periodic table which contains elements having the similar properties |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Glass full of marbles Coins | If u assume the glass to be a lattice structure and drop the coin in the glass. This would depict an interstitial compound. |
Real life uses :
To make jewellery, utensils
Places to visit :
Bank, jewellery shop
Practical examples around us
| Examples | Explainations |
|---|---|
| Gold coins | • Various precious metals such as silver, gold and platinum and industrially important |
What you learn in Theory:
•
Interstitial compounds are those which are formed when
small atoms like H, C or N are trapped inside the crystal lattices of metals.
•
They are usually non stoichiometric and are neither
typically ionic nor covalent,
• Example: TiC, Mn4N,
Fe3H, VH0.56 and TiH1.7, etc
•
The formulas quoted do not, of course, correspond to
any normal oxidation state of the metal. Because of the nature of their
composition, these compounds are referred to as interstitial compounds.
•
The main physical and chemical characteristics of
these compounds are as follows:
•
(i) They have high melting points, higher than those
of pure metals.
(ii) They are very
hard, some borides approach diamond in hardness.
What you learn in Practice:
•
Interstitial compounds are those which are formed when
small atoms like H, C or N are trapped inside the crystal lattices of metals.
•
They are usually non stoichiometric and are neither
typically ionic nor covalent,
• Example: TiC, Mn4N,
Fe3H, VH0.56 and TiH1.7, etc
•
The formulas quoted do not, of course, correspond to
any normal oxidation state of the metal. Because of the nature of their
composition, these compounds are referred to as interstitial compounds.
•
The main physical and chemical characteristics of
these compounds are as follows:
•
(i) They have high melting points, higher than those
of pure metals.
(ii) They are very
hard, some borides approach diamond in hardness.