Kerala Syllabus

1. TEACHING MANUAL-1
Learning Materials: Text Book, Worksheet Multimedia etc.
Activities: Discussions Table completion, analysing, model making
Process: Recognises, observation, analysis, conclusion

2. Activity-1 Observe the Figure 1.4 in your text and answer the following question?
1. Identify the table.
2. What is the basis of the classification of elements in this table?
3. Can we use this table to predict the properties of the elements?
4. Can we se any connection in the arrangement of elements with atomic structure?
5. Write some thing about the following;
a. Atom
b. Proton, neutron and electron.
c. Atomic number and Mass number.
Presentation
Discussion
Consolidation

3. 1. This is Modern periodic table.
2. Electrons are classified on the basis of atomic number.
3. Periodic table can be used to predict the properties of elements..
4. Arrangement of elements have a greater relation with the atomic number.
5. Atom.
The smallest indivisible particles.
Proton
Positive charged particle. Found in the nucleus. Equal to the number of electrons .
Neutron .
Charge less particle. Heavy particle. Found in the nucleus.
Electron.
Negatively charged particles. Equal to the number of protons.
Atomic Number(Z)
It is the number of proton.
Mass number(M)
Total number of protons and neutrons.
Consolidation

4. 1. Identify the given atom model
2. How many protons and electrons are found in this
atom?
3. Find out the number of neutrons present if its mass
number is 23.
4. How many shells are present in it? Identify them.
5. How many electrons can be accommodated
maximum in each shells?
6. Write its electronic configuration.
ACTIVITY-2
Presentation
Discussion
Consolidation

5. CONSOLIDATION
1. This atom model is called Bohr atom model.
2. 11 protons and 11 electrons.
3. Number of neutron is 12.
4. 3 shells. K,L,M
5. Maximum electrons that can be accommodated in each shell is
K-2, L-8, M-18
6. Electronic configuration is 2,8,1

6. ACTIVITY-3
Find out the following.
1. Among the shells K, L, M, N which shell will have more energy
and which will have less energy?
2. What happened in the energy of electrons when it is moving
away from the nucleus. Why?
(Refer page 8 of the text book)

7. CONSOLIDATION

8. ACTIVITY-4

9. Consolidation
8
10
2 18
2 88

10. Activity - 5
Atomic number of Potassium is19 .Write the Electronic
configuration of this elements.
Compare this electronic configuration with the electronic
configuration given in the periodic Table..
Can you see any difference in the electronic configuration?
If yes find out the reason with the help of text book.

11. Activity - 5
Atomic number of Potassium is19 .The Electronic configuration of
this element is 2,8,8,1.
oK,L,M,N arePrincipal Energy levels. Sub energy Levels are
found in the Principal energy level. These are s , p , d , f.
o These are called sub shells .
o Principal energy levels are called shells.

12. Following this the
teacher asked to read
the write up and also ask
to prepare five quiz
questions and answers.
Activity-6

13. Video1
C:UsersUSERDesk
topsub
shellsvideoplayback.
mp4
video2
Subshell

14. Follow up activity

16. Questions:
1. Which sub shell is found in all shells?
2. Write the maximum number of electrons that can be accommodated in
each sub shell.
3. In which shell d and f sub shells are not present.
4. From which shell on wards f sub shells are found?

17. Find out the following:
1. Arrange the following sub shells in the increasing order of their energy

20. video

22. Complete the following:
a. Identify the noble gas found before the element K.
b. Write their Electronic configuration and Sub shell Electronic
Configuration.
c. Write the atomic number of K and Write its shell and sub shell
electronic configuration.
d. Represent the Symbol of the noble gas replacing the Sub shell
Electronic configuration of K with square bracket

26. Activity- Analysis and synthesis

27. Activity- Analysis and synthesis
3
K - s L - s.p M - s,p,d
s
11
11

28. Activity- Observation , Classification

29. Activity- Observation , Analysis and synthesis

30. CONSOLIDATION

31. Activity – Table completion
Complete the following Table in your Science Diary and a few more
elements to the list.
CONSOLIDATION

32. Activity – Table completion & analysis
Number of outer
electrons
CONSOLIDATION

33. Number of outer
electrons
CONSOLIDATION
Activity – Table completion & analysis

34. Number of outer electrons
CONSOLIDATION
Activity – Table completion & analysis

35. 1. What relation can be found in the period number with its shell ?

39. Number of outer
electrons
CONSOLIDATION

40. Hints:
Have these elements need any more electrons to fill the sub shell
completely?
What about the stability of these elements?
Why they are called noble gases?

41. Hints:
What happens the size of the atom on moving along the period from left
to right?
What about the attraction of electrons towards the nucleus?
What about electro negativity?
CONSOLIDATION

43. Number of outer
electrons
Number of d-
electrons
CONSOLIDATION

45. Representative elements show group vice similarity in properties. Explain on the basis
of outer electrons present in their atoms?
Transition elements show vertical and horizontal similarities in properties. Why?
CONSOLIDATION

46. 1. Write the chemical formula of ferrous and ferric chloride
if the valency of chlorine is 1.
2. Find the oxidation state of Fe in both compounds.
3. Explain the reason for the variation in oxidation state.

48. Find the atomic number of Mn.
Write the sub shell electronic configuration of Mn.
 Find Block, group and period.
Complete the table given below

51. Complete the table and find out the atomic number of each element
by writing their complete sub shell electronic configuration