what is the mass no of the atoms 1 to 20
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Hydrogen
1
Helium
4
Lithium
7
Beryllium
9
Boron
11
Carbon
12
Nitrogen
14
Oxygen
16
Fluorine
19
Neon
20
Sodium
23
Magnesium
24
Aluminum
27
Silicon
28
Phosphorus
31
Sulfur
32
Chlorine
35
Argon
40
Potassium
39
Calcium
40
1
Helium
4
Lithium
7
Beryllium
9
Boron
11
Carbon
12
Nitrogen
14
Oxygen
16
Fluorine
19
Neon
20
Sodium
23
Magnesium
24
Aluminum
27
Silicon
28
Phosphorus
31
Sulfur
32
Chlorine
35
Argon
40
Potassium
39
Calcium
40
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1
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