Chapter 5 - The periodic table- part ii (icse board) Class IX

1. ICSE
Class 9
Chemistry - Chapter 5
The periodic table
(PART – II)

3. What’s the difference between atomic mass and
atomic number?

4. 5.5 Atomic number as the basis for
Modern Periodic table


5. 5.6 The Modern Periodic table

11. Electron Configurations of Elements

14. Electronic configuration
Group 1
1
H
3
Li
11
Na
19
K
1
2, 1
2, 8, 1
2, 8, 8, 1
1 Valence electron
Valency = 1

15. Group 2
4
Be
12
Mg
20
Ca
2,2
2,8,2
2,8,8,2
2 Valence electron
Valency = 2

19. •Reasons for the classification of elements
•Dobereiner’s Triad
•Newlan’ds law of octaves
•Mendeleev’s periodic table
•Atomic number as the basis for Modern Periodic table
•The Modern Periodic table
•Types of elements
•Merits of The Modern Periodic table
•Defects of The Modern Periodic table
•General trends in The Modern Periodic table
•Alkali metals
•Alkaline earth metals
•Uses of the periodic table