give the answer of element atomic mass
1. hydrogen
2.helium
3.lithium
4.berylium
5. boron
6. carbon
7. nitrogen
8. oxygen
9. fluorine
10. neon
11. sodium
12. magnesium
13. aluminium
14. silicon
15. phosphorus
16. sulphur
17. chlorine
18. argon
19. potassium
20. calcium
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