Question

Atomic mass of 1st 20 elements according to preodic table

Answer 1

Answer:

1hydrogen - 2

2helium- 4

3lithium -7

4berrylium-9

5boron-11

6carbon-12

7nitrogen-14

8oxygen-16

9fluorine-19

10neon-20

11sodium-23

12magnesium-24

13aluminium-27

14silicon-28

15phosphorous-31

16sulphur-32

17clorine-35.5

18argon-40

19pottasium-40

20calcium-40

hope it helps