Making In Order- The Modern Periodic Table
Chapter Name : Periodic Classification Of Elements |
Sub Topic Code : 102_10_05_03_02 |
Topic Name : Making In Order- The Modern Periodic Table |
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Sub Topic Name : Position Of Elements In The Modern Periodic Table |
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Introduction
·
The Modern Periodic Table has 18 vertical
columns knows as Groups
·
The
Modern Periodic Table has 7 horizontal rows knows as Periods
·
All
elements of a particular group contain the same number of valence electrons.
·
Groups:
identical outer shell configuration. Number of shells increase as we go down
the group.
·
All
elements of a particular period contain the same number of shells.
·
Number
of valence electrons increase by one across the period
·
Atoms
of different elements with same number of occupied shells are placed in
same period.
·
Each
period has 2n2 number of elements where n is the number of shells.
· Chemical reactivity of elements is determined by number of valence electrons and distance of valence electrons from the nucleus.
Pre-Requisites:
Periodic table
Activity:
Study the arrangement of different elements in the
periodic table and see the similarity in properties within the same group or
period.
Real Life Question:
How were different elements identified?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Elements | A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus. Elements are divided into metals, metalloids, and non-metals. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Periodic table | Study the arrangement of different elements in the periodic table. |
Real life uses :
For the identification and grouping and classification
of elements.
Places to visit :
Laboratory.
Practical examples around us
| Examples | Explainations |
|---|---|
| Metals (Iron, Copper, Lead) | All these substances have similar properties. |
What you learn in Theory:
·
The Modern Periodic Table has 18 vertical
columns knows as Groups
·
The
Modern Periodic Table has 7 horizontal rows knows as Periods
·
All
elements of a particular group contain same number of valence electrons.
·
Groups:
identical outer shell configuration. Number of shells increase as we go down
the group.
·
All
elements of a particular period contain same number of shells.
·
Number
of valence electrons increase by one across the period
·
Atoms
of different elements with same number of occupied shells are placed in
same period.
·
Each
period has 2n2 number of elements where n is the number of shells.
· Chemical reactivity of elements is determined by number of valence electrons and distance of valence electrons from the nucleus.
What you learn in Practice:
For classification of elements.