Anomalous Properties Of Lithium
Chapter Name : The S- Block Elements |
Sub Topic Code : 102_11_10_04_02 |
Topic Name : Anomalous Properties Of Lithium |
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Sub Topic Name : Points Of Similarities Between Lithium And Magnesium |
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Introduction
• The similarity between lithium and magnesium is particularly striking and arises because of their similar sizes : Atomic radii, Li = 152 pm, Mg = 160 pm Ionic radii : Li+ = 76 pm, Mg2+= 72 pm • Both lithium and magnesium are harder and lighter than other elements in the respective groups. • Lithium and magnesium react slowly with water. Their oxides and hydroxides are much less soluble and Their hydroxides decompose on heating. Both form a nitride, Li3N and Mg3N2, by direct combination with nitrogen.
Pre-Requisites:
Atom, compound, element,
Activity:
Lithium metal is also used for making Li batteries.
Real Life Question:
What is Lithium used for?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Alkali metals | Group 1 elements. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Bearings for motor engines | Used to make alloys with lead for bearings for motor engines. |
Real life uses :
• Lithium metal is used to make useful alloys, for example with lead to make ‘white metal’ bearings for motor engines.
Places to visit :
Kitchen.
Practical examples around us
| Examples | Explainations |
|---|---|
| Lithium metal | Used to make alloys with lead for bearings for motor engines. |
What you learn in Theory:
• The similarity between lithium and magnesium is particularly striking and arises because of their similar sizes : • Atomic radii, Li = 152 pm, Mg = 160 pm • Ionic radii : Li+ = 76 pm, Mg2+= 72 pm • Both lithium and magnesium are harder and lighter than other elements in the respective groups. • Lithium and magnesium react slowly with water. • Their oxides and hydroxides are much less soluble and their hydroxides decompose on heating. • Both form a nitride, Li3N and Mg3N2, by direct combination with nitrogen.
What you learn in Practice:
• Lithium metal is used to make useful alloys, for example with lead to make ‘white metal’ bearings for motor engines.