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ATOMIC MASS OF FIRST 20ELEMENTS

 1)Hydrogen -1.00797

2)Helium -4.0026

3)Lithium -6.939

4)Beryllium -9.0122

5)Boron -10.811

6)Carbon -12.033315

7)Nitrogen -14.0467

8)Oxygen -15.994

9)Fluorine  -18.9984

10) Neon- 20.183

11)Sodium -22.9898

12)Magnesium-24.312

13)Aluminium -26.9815

14)Silicon -28.086

(15)Phosphorus -30.9734

(16) Sulphur-32.064

(17)Chlorine -35.453

(18)Argon -39.948

(19)Potassium -39.102

(20)Calcium-40.08