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Atomic Mass of the First 20 Elements, rounded according to IB standards.
Hydrogen (H)
1.01
Helium (He)
4
Lithium (Li)
6.94
Beryllium (Be)
9.01
Boron (B)
10.81
Carbon (C)
12.01
Nitrogen (N)
14.01
Oxygen (O)
16
Flourine (F)
19
Neon (Ne)
20.18
Sodium (Na)
22.99
Magnesium (Mg)
24.31
Aluminum (Al)
26.98
Silicon (Si)
28.09
Phosphorus (P)
30.97
Sulfur (S)
32.07
Chlorine (Cl)
35.45
Argon (Ar)
39.95
Potassium (K)
39.1
Calcium (Ca)
40.08
Note 
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