1. Energy lleevveellss aanndd ssuubb--lleevveellss
Presented By
HEMA.V

2. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Energy levels
• These are broadly similar to the “shells” used
in Chemistry
Energy level 1 is lowest in energy and closest
to the nucleus

3. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Sub-levels
• The main energy levels contain sub-levels
• The different main energy levels have
different sub-levels in them
There are four types: s, p, d, f

4. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level

5. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1

6. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s

7. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1

8. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2

9. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2 2

10. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2 2
2

11. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2 2
2
s 1 2

12. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2 2
2
s 1 2
p

13. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2 2
2
s 1 2
p 3

14. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2 2
2
s 1 2
p 3 6

15. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2 2
2
s 1 2
8
p 3 6

16. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2 2
2
s 1 2
8
p 3 6
3

17. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2 2
2
s 1 2
8
p 3 6
3
s 1 2
p 3 6

18. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2 2
2
s 1 2
8
p 3 6
3
s 1 2
p 3 6
d

19. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2 2
2
s 1 2
8
p 3 6
3
s 1 2
p 3 6
d 5

20. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2 2
2
s 1 2
8
p 3 6
3
s 1 2
p 3 6
d 5 10

21. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2 2
2
s 1 2
8
p 3 6
3
s 1 2
p 3 6 18
d 5 10

22. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2 2
2
s 1 2
8
p 3 6
3
s 1 2
p 3 6 18
d 5 10
4

23. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2 2
2
s 1 2
8
p 3 6
3
s 1 2
p 3 6 18
d 5 10
4
s 1 2
p 3 6
d 5 10

24. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2 2
2
s 1 2
8
p 3 6
3
s 1 2
p 3 6 18
d 5 10
4
s 1 2
p 3 6
d 5 10
f

25. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2 2
2
s 1 2
8
p 3 6
3
s 1 2
p 3 6 18
d 5 10
4
s 1 2
p 3 6
d 5 10
f 7

26. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2 2
2
s 1 2
8
p 3 6
3
s 1 2
p 3 6 18
d 5 10
4
s 1 2
p 3 6
d 5 10
f 7 14

27. EEnneerrggyy lleevveellss aanndd ssuubb--lleevveellss
Main energy
level Sub-levels
Max. no. of
electron pairs
in sub-level
Max. no. of
electrons in
sub-level
Max. no. of
electrons in
main level
1 s 1 2 2
2
s 1 2
8
p 3 6
3
s 1 2
p 3 6 18
d 5 10
4
s 1 2
32
p 3 6
d 5 10
f 7 14