Group-2 Elements: Alkaline Earth Metals
Chapter Name : The S- Block Elements |
Sub Topic Code : 102_11_10_07_07 |
Topic Name : Group-2 Elements: Alkaline Earth Metals |
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Sub Topic Name : Uses |
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Introduction
• Beryllium is used in the manufacture of alloys. • Copper-beryllium alloys are used in the preparation of high strength springs. • Metallic beryllium is used for making windows of X-ray tubes. • Magnesium forms alloys with aluminium, zinc, manganese and tin. • Magnesium-aluminium alloys being light in mass are used in air-craft construction. • Magnesium (powder and ribbon) is used in flash powders and bulbs, incendiary bombs and signals. • A suspension of magnesium hydroxide in water (called milk of magnesia) is used as antacid in medicine. • Magnesium carbonate is an ingredient of toothpaste. • Calcium is used in the extraction of metals from oxides which are difficult to reduce with carbon. • Calcium and barium metals, owing to their reactivity with oxygen and nitrogen at elevated temperatures, have often been used to remove air from vacuum tubes. • Radium salts are used in radiotherapy, for example, in the treatment of cancer.
Pre-Requisites:
Alkali earth metals, elements, periodic table
Activity:
Bones and teeth have calcium in them.
Real Life Question:
Where do you find calcium in the body?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Alkaline earth metals | • Group 2 elements. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Periodic table | Look at the elements present in the group 2 of the periodic table. |
Real life uses :
Calcium is important for the bone and teeth development
Places to visit :
Kitchen.
Practical examples around us
| Examples | Explainations |
|---|---|
| Milk, yogurt | These are rich sources of calcium |
What you learn in Theory:
• Beryllium is used in the manufacture of alloys. • Copper-beryllium alloys are used in the preparation of high strength springs. • Metallic beryllium is used for making windows of X-ray tubes. • Magnesium forms alloys with aluminium, zinc, manganese and tin. • Magnesium-aluminium alloys being light in mass are used in air-craft construction. • Magnesium (powder and ribbon) is used in flash powders and bulbs, incendiary bombs and signals. • A suspension of magnesium hydroxide in water (called milk of magnesia) is used as antacid in medicine. • Magnesium carbonate is an ingredient of toothpaste. • Calcium is used in the extraction of metals from oxides which are difficult to reduce with carbon. • Calcium and barium metals, owing to their reactivity with oxygen and nitrogen at elevated temperatures, have often been used to remove air from vacuum tubes. • Radium salts are used in radiotherapy, for example, in the treatment of cancer.
What you learn in Practice:
• Important ions for the body like calcium and magnesium belong to group 2 in the periodic table.