Question

List the atomic mass of first 20 elements

Answer 1

HERE IS YOUR ANSWER

ATOMIC MASS AND ATOMIC NUMBER OF FIRST 20 ELEMENTS

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