Electron arrangement of the first 20 elements

The table below shows the electron arrangement for the first 20 elements in the Periodic Table along with their Atomic number and symbols:

 

Element Electrons diagram and configuration

1

H

hydrogen


1

2

He

helium


2

3

Li

lithium


2.1

4

Be

beryllium


2.2

5

B

boron


2.3

6

C

carbon


2.4

7

N

nitrogen


2.5

8

O

oxygen


2.6

9

F

fluorine


2.7

10

Ne

neon


2.8

11

Na

sodium


2.8.1

12

Mg

magnesium


2.8.2

13

Al

aluminium


2.8.3

14

Si

silicon


2.8.4

15

P

phosphorus


2.8.5

16

S

sulfur


2.8.6

17

Cl

chlorine


2.8.7

18

Ar

argon


2.8.8

19

K

potassium


2.8.8.1

20

Ca

calcium


2.8.8.2