Periodic Trends In Properties Of Elements
Chapter Name : Classification Of Elements And Periodicity In Properties |
Sub Topic Code : 102_11_03_07_01 |
Topic Name : Periodic Trends In Properties Of Elements |
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Sub Topic Name : Atomic Radius |
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Introduction
• There are many patterns seen in the physical and chemical properties of elements as we move down in a group or move across a period in the Periodic Table. Ex: atomic Radius. • Atomic Radius is the distance from the center of the nucleus to the “edge” of the electron cloud at the outermost shell. • The atomic size generally decreases from left to right a period. • The atomic radius increases down the group.
Pre-Requisites:
Element, periodic properties, classification, valence shell
Activity:
Audiences sitting at the back have their view obstructed because of the audience sitting in the front rows.
Real Life Question:
Why is the view obstructed for the audience in the back at a show?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Atomic Radius | The distance from the center of the nucleus to the “edge” of the electron cloud at the outermost shell. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Tennis ball | Measure the approximate radius of a tennis ball. |
Real life uses :
Atomic radius helps to figure out the size of a molecule.
Places to visit :
A movie hall, a concert
Practical examples around us
| Examples | Explainations |
|---|---|
| A concert | Audience standing at the back in a concert cannot move up in front due to the crowd in front. |
What you learn in Theory:
• There are many patterns seen in the physical and chemical properties of elements as we move down in a group or move across a period in the Periodic Table. Ex: atomic Radius. • Atomic Radius is the distance from the center of the nucleus to the “edge” of the electron cloud at the outermost shell. • The atomic size generally decreases from left to right a period. • The atomic radius increases down the group.
What you learn in Practice:
The larger the atomic radius, the bigger the atom is.