Group-2 Elements: Alkaline Earth Metals
Chapter Name : The S- Block Elements |
Sub Topic Code : 102_11_10_07_02 |
Topic Name : Group-2 Elements: Alkaline Earth Metals |
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Sub Topic Name : Atomic And Ionic Radii |
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Introduction
• Group 2 includes beryllium, magnesium, calcium, strontium, barium and radium. • These elements with the exception of beryllium are commonly known as the alkaline earth metals. • The atomic and ionic radii of the alkaline earth metals are smaller than those of the corresponding alkali metals in the same periods. • This is due to the increased nuclear charge in these elements. • Within the group, the atomic and ionic radii increase with increase in atomic number.
Pre-Requisites:
Alkali earth metals, elements, periodic table, atomic radii
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:
• Group 2 includes beryllium, magnesium, calcium, strontium, barium and radium. • These elements with the exception of beryllium are commonly known as the alkaline earth metals. • The atomic and ionic radii of the alkaline earth metals are smaller than those of the corresponding alkali metals in the same periods. • This is due to the increased nuclear charge in these elements • Within the group, the atomic and ionic radii increase with increase in atomic number.
What you learn in Practice:
• Important ions for the body like calcium and magnesium belong to group 2 in the periodic table.