hi

1. WELCOME
[GOVT. VHSS VEERANAKAVU]
STANDARD : IX
SUBJECT: CHEMISTRY
-V.S. VIMAL NAYAN

2. UNIT – 3
PERIODIC TABLE
AND
THE CHEMICAL
BOND

3. Answer the following questions and note down in your note
book

4. COMPLETE THE TABLE
Period
Number
Element in each
period
Name of
Shells of
atom
Total No. Of
Shells
1
2
3
2 K 1
8 K,L 2
4
5

5. . Which is the smallest period? Which are
the elements in it?
. What is the relation ship between the
period and the number of shells?
DISCUSSION POINTS

6. . First period is the smallest period
. First period have only H and He
. No. Of period = No.Of shells
CONSOLIDATION

7. Observe the sixth and seventh period

8. . Are 14 elements after Lanthanum of sixth
period in same row?
. Are 14 elements after Actinium of
seventh period in same row?
DISCUSSION POINTS

9. . 14 elements after Lanthanum of sixth
period and Actinium of seventh period
are not in same row
. They are called Lanthanones and
Actinones
CONSOLIDATION

10. . Lanthanones and Actinones are
together called Inner Transition
Elements
. Most of the Actinones are artificial
elements

11. Activity
I have an element whose
Atomic number = 17
So complete the following table

12. Electronic
Configuration
Period Number
Group Number
Element Family
Valency
Metal or Non Metal
?
?
?
?
?
?

13. Review and Follow-Up Activity
Given below is the electronic configuration of
elements A, B, C, D
A - 2 , 2
B - 2, 8, 2
C - 2, 8, 5
D - 2, 8
- Which are elements of same period?
- Which are elements of same group?
- Which one is noble element?
- Which is the group and period of element C?

14. THANK YOU!