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First 20 Elements, Atomic Number And Mass.


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Hydrogen
 

1
H
1
Helium
 

4
He
2
Lithium
 

7
Li
3
Beryllium
 

9
Be
4
Boron
 

11
B
5
Carbon
 

12
C
6
Nitrogen
 

14
N
7
Oxygen
 

16
O
8
Fluorine
 

19
F
9
Neon
 

20
Ne
10
Sodium
 

23
Na
11
Magnesium
 

24
Mg
12
Aluminium
 

27
Al
13
Silicon
 

28
Si
14
Phosphorus
 

31
P
15
Sulphur
 

32
S
16
Chlorine
 

35.5
Cl
Argon
 

40
Ar
18
Potassium
 

39
K
19
Calcium
 

40
Ca
20

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