Chemical periodicity

1. Exercise 1
Elements Na Mg Al Si P S Cl
Electronic
config.
Valence
electrons
Group No.

2. Exercise 1
Elements Na Mg Al Si P S Cl
Electronic [Ne]
config. 3s1
Valence
electrons
Group No.

3. Exercise 1
Elements Na Mg Al Si P S Cl
Electronic [Ne]
config. 3s1
Valence
1
electrons
Group No.

4. Exercise 1
Elements Na Mg Al Si P S Cl
Electronic [Ne]
config. 3s1
Valence
1
electrons
Group No. 1

5. Exercise 1
Elements Na Mg Al Si P S Cl
Electronic [Ne] [Ne]
config. 3s1 3s2
Valence
1
electrons
Group No. 1

6. Exercise 1
Elements Na Mg Al Si P S Cl
Electronic [Ne] [Ne]
config. 3s1 3s2
Valence
1 2
electrons
Group No. 1

7. Exercise 1
Elements Na Mg Al Si P S Cl
Electronic [Ne] [Ne]
config. 3s1 3s2
Valence
1 2
electrons
Group No. 1 2

8. Exercise 1
Elements Na Mg Al Si P S Cl
Electronic [Ne] [Ne] [Ne]
config. 3s1 3s2 3s23p1
Valence
1 2 2+1=3
electrons
Group No. 1 2 3

9. Exercise 1
Elements Na Mg Al Si P S Cl
Electronic [Ne] [Ne] [Ne] [Ne]
config. 3s1 3s2 3s23p1 3s23p2
Valence
1 2 2+1=3 2+2=4
electrons
Group No. 1 2 3 4

10. Exercise 1
Elements Na Mg Al Si P S Cl
Electronic [Ne] [Ne] [Ne] [Ne] [Ne]
config. 3s1 3s2 3s23p1 3s23p2 3s23p3
Valence
1 2 2+1=3 2+2=4 2+3=5
electrons
Group No. 1 2 3 4 5

11. Exercise 1
Elements Na Mg Al Si P S Cl
Electronic [Ne] [Ne] [Ne] [Ne] [Ne] [Ne]
config. 3s1 3s2 3s23p1 3s23p2 3s23p3 3s23p4
Valence
1 2 2+1=3 2+2=4 2+3=5 2+4=6
electrons
Group No. 1 2 3 4 5 6

12. Exercise 1
Elements Na Mg Al Si P S Cl
Electronic [Ne] [Ne] [Ne] [Ne] [Ne] [Ne] [Ne]
config. 3s1 3s2 3s23p1 3s23p2 3s23p3 3s23p4 3s23p5
Valence
1 2 2+1=3 2+2=4 2+3=5 2+4=6 2+5=7
electrons
Group No. 1 2 3 4 5 6 7

13. Exercise 1
Elements Na Mg Al Si P S Cl
Electronic [Ne] [Ne] [Ne] [Ne] [Ne] [Ne] [Ne]
config. 3s1 3s2 3s23p1 3s23p2 3s23p3 3s23p4 3s23p5
Valence
1 2 2+1=3 2+2=4 2+3=5 2+4=6 2+5=7
electrons
Group No. 1 2 3 4 5 6 7
Outermost quantum shell = 3
 the principal quantum number of the valence shell is 3
 all the elements in this period belong to Period 3