9th Class Chemistry
Chapter 3: Periodic Table and Periodicity of Properties
Periodic Table and Periodicity of Properties:
1. History of Periodic Table:
- Dobereiner's Triads
- Newlands' Law of Octaves
- Mendeleev's Periodic Table
- Modern Periodic Table
2. Modern Periodic Table:
- Elements arranged by atomic number.
- 7 periods and 18 groups.
3. Periodic Trends:
- Atomic size, Ionization energy, Electronegativity, Metallic character.
4. Importance:
- Predict properties, classification of elements.
Chapter 3: Periodic Table and Periodicity of Properties
Periodic Table and Periodicity of Properties:
1. History of Periodic Table:
- Dobereiner's Triads
- Newlands' Law of Octaves
- Mendeleev's Periodic Table
- Modern Periodic Table
2. Modern Periodic Table:
- Elements arranged by atomic number.
- 7 periods and 18 groups.
3. Periodic Trends:
- Atomic size, Ionization energy, Electronegativity, Metallic character.
4. Importance:
- Predict properties, classification of elements.
