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electron configurations

Page history last edited by danielle.lafont@... 9 years, 9 months ago

I thought this might help for more practice with knowing the electron configuration an for other ways as well.

Electronic configuration of various atoms are given in following table with valence subshell.

Table 4

Atomic No.

Element

Atomic wt.

Eletronic configuration

Valence subshell

Common valences

     

n=1

n=2

n=3

   

1

Hydrogen

1

1s1

   

1s1

+1, -1

2

Helium

4

1s2

   

1s2

0

3

Lithium

7

1s2

2s1

 

2s1

 
 

+1

           

4

Beryllium

9

1s2

2s2

 

2s2

+2

5

Boron

11

1s2

2s22p1

 

2p1

+3

6

Carbon

 

12

1s2

2s22p2

 

2p2

+4, +2, -4

7

Nitrogen

14

1s2

2s22p3

 

2p3

+5, +3, -3

8

Oxygen

16

1s2

2s22p4

 

2p4

-2

9

Fluorine

19

1s2

2s22p5

 

2p5

-1

10

Neon

20

1s2

2s22p6

 

2p6

0

11

Sodium

23

1s2

2s22p6

3s1

3s1

+1

12

Magnesium

24

1s2

2s22p6

3s2

3s2

+2

13

Aluminium

27

1s2

2s23s2

3p1

3p1

+3

14

Silicon

28

1s2

2s22p6

3s23p2

3p2

+4

15

Phosphorous

31

1s2

2s22p6

3s23p3

3p3

+5 , +3 , -3

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