Periodic Trends In Properties Of Elements
Chapter Name : Classification Of Elements And Periodicity In Properties |
Sub Topic Code : 102_11_03_07_05 |
Topic Name : Periodic Trends In Properties Of Elements |
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Sub Topic Name : Electronegativity |
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Introduction
• The relative ability of each atom to attract electrons from another atom in a chemical compound is called Electronegativity. • It is although reported in the Pauling scale. • Metals are electron givers and have low electro negativities. • Nonmetals are electron takers and have high electro negativities. • Electronegativity values decrease with the increase in atomic radii down a group.
Pre-Requisites:
Element, valence shell, enthalpy, metallic and non-metallic character
Activity:
Strong magnet attracts metal greater than a weak magnet.
Real Life Question:
How do sodium and chloride atoms bind to each other in a salt crystal?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Electronegativity | The relative ability of each atom to attract electrons from another atom in a chemical compound is called Electronegativity. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Magnet | A strong magnet would attract a piece of metal more than a weak magnet. |
Real life uses :
Salt is a crystal in which Chlorine atom attracts an electron from the sodium atom.
Places to visit :
School – Strong magnet attracts metal more than weak magnets.
Practical examples around us
| Examples | Explainations |
|---|---|
| Magnet | It is easier to remove metal kept a distance away from a magnet than the one kept close to it. |
What you learn in Theory:
• The relative ability of each atom to attract electrons from another atom in a chemical compound is called Electronegativity. • It is although reported in the Pauling scale. • Metals are electron givers and have low electro negativities. • Nonmetals are electron takers and have high electro negativities. • Electronegativity values decrease with the increase in atomic radii down a group.
What you learn in Practice:
How do chemical ionic compounds form? E.g. salt