Periodic Table പീരിയോഡിക് ടേബിൾ | SCERT Class 9 Chemistry Chapter 2 | Kerala PSC Science Class

In this video, we decode SCERT Class 9 Chemistry Chapter 2: Periodic Table. This is a high-yield topic for LDC, LGS, LP/UP Assistant, and Degree Level Preliminary exams. We break down the concepts simply, moving from the history of the table to the modern trends.

📌 Topics Covered in this Session:


History of Classification: The limitations of Mendeleev's Atomic Mass table and how Henry Moseley used Atomic Number to create the Modern Periodic Law.
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Structure of the Table: Understanding the 7 Periods (horizontal rows) and 18 Groups (vertical columns).

The Magic of Electronic Configuration:

How to find the Group Number using the number of electrons in the valence shell.

How to find the Period Number using the number of shells.

Shortcuts for PSC Exams!

Element Families:

Alkali Metals (Group 1) & Alkaline Earth Metals (Group 2).
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Transition Elements (Groups 3-12) & their coloured compounds.
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Halogens (Group 17) & Noble Gases (Group 18).
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Lanthanoids & Actinoids: Understanding the inner transition elements located at the bottom of the table.
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Periodic Trends: How atomic size changes as you move down a group (increases) and across a period (decreases) due to the screening effect and nuclear charge.
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📝 Important Points for PSC:


Mendeleev arranged elements by Atomic Mass.


Henry Moseley arranged elements by Atomic Number.


Transition elements fill electrons in the shell inner to the outermost shell.

New elements like Nihonium (Nh) and Moscovium (Mc).

Use this class to secure full marks in the Chemistry section of your upcoming PSC exams!
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