The Actinides
Chapter Name : The D- And F- Block Elements |
Sub Topic Code : 102_12_08_06_04 |
Topic Name : The Actinides |
|
Sub Topic Name : General Characteristics And Comparison With Lanthanoids |
|
Introduction
• The actinoids include the fourteen elements
from Th to Lr.
• The actinoid metals are all silvery in
appearance but display a variety of structures.
• The structural variability is obtained due to
irregularities in metallic radii which are far
greater than in lanthanoids.
•
Hydrochloric acid attacks all metals but most are
slightly affected by nitric acid due to the formation of protective oxide
layers.
•
Alkalies have no action.
•
The magnetic properties of the actinoids are more
complex than those of the lanthanoids.
Although the
variation in the magnetic susceptibilityof the actinoids with the number of
unpaired 5 f electrons is roughlyparallel to the corresponding lanthanoids, the
latter have higher values.
Pre-Requisites:
Periodic table, elements
Activity:
Smoke detectors contain Americium-241
Real Life Question:
null
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 |
|---|---|
| Smoke detectors | • Smoke detectors contain Americium-241 |
Real life uses :
For making smoke detectors
Places to visit :
Kitchen
Practical examples around us
| Examples | Explainations |
|---|---|
| Smoke detectors | Smoke detectors contain Americium-241 |
What you learn in Theory:
• The actinoids include the fourteen elements
from Th to Lr.
• The actinoid metals are all silvery in
appearance but display a variety of structures.
• The structural variability is obtained due to
irregularities in metallic radii which are far
greater than in lanthanoids.
•
Hydrochloric acid attacks all metals but most are
slightly affected by nitric acid due to the formation of protective oxide
layers.
•
Alkalies have no action.
•
The magnetic properties of the actinoids are more
complex than those of the lanthanoids.
Although the
variation in the magnetic susceptibilityof the actinoids with the number of
unpaired 5 f electrons is roughlyparallel to the corresponding lanthanoids, the
latter havehigher values.
What you learn in Practice:
• The actinoids include the fourteen elements
from Th to Lr.
• The actinoid metals are all silvery in
appearance but display a variety of structures.
• The structural variability is obtained due to
irregularities in metallic radii which are far
greater than in lanthanoids.
•
Hydrochloric acid attacks all metals but most are
slightly affected by nitric acid due to the formation of protective oxide
layers.
•
Alkalies have no action.
•
The magnetic properties of the actinoids are more
complex than those of the lanthanoids.
Although the
variation in the magnetic susceptibilityof the actinoids with the number of
unpaired 5 f electrons is roughlyparallel to the corresponding lanthanoids, the
latter havehigher values.