General Properties Of The Transition Elements
Chapter Name : The D- And F- Block Elements |
Sub Topic Code : 102_12_08_03_09 |
Topic Name : General Properties Of The Transition Elements |
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Sub Topic Name : Formation Of Colored Ions |
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Introduction
• When an electron from a lower energy d orbital
is excited to a higher energy d orbital, the energy of excitation corresponds
to the frequency of light absorbed
•
This frequency generally lies in the visible region.
The colour observed corresponds to the complementary colour of the light
absorbed.
•
The frequency of the light absorbed is determined by
the nature of the ligand.
In aqueous solutions
where water molecules are the ligands, the colours of the ions observed
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 |
|---|---|
| Color Wheel | Observe the colors you can see through a color wheel |
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:
• When an electron from a lower energy d orbital
is excited to a higher energy d orbital, the energy of excitation corresponds
to the frequency of light absorbed
•
This frequency generally lies in the visible region.
The colour observed corresponds to the complementary colour of the light absorbed.
•
The frequency of the light absorbed is determined by
the nature of the ligand.
In aqueous solutions
where water molecules are the ligands, the colours of the ions observed
What you learn in Practice:
• When an electron from a lower energy d orbital
is excited to a higher energy d orbital, the energy of excitation corresponds
to the frequency of light absorbed
•
This frequency generally lies in the visible region.
The colour observed corresponds to the complementary colour of the light absorbed.
•
The frequency of the light absorbed is determined by
the nature of the ligand.
In aqueous solutions
where water molecules are the ligands, the colours of the ions observed