Question

Mass Number of first 30 elements​

Answer 1

Answer:

1. Hydrogen =1

2. Helium =4

3. Lithium =6

4. Berelium =9

5. Boron =10

6. Carbon =12

7. Nitrogen =14

8. Oxygen =16

9. Flourine =18

10. Neon=20

11. Sodium =23

12. Magnesium =25

13. Aluminium =26

14. Silicon =28

15. Phosphorus =30~31

16. Sulphur =32

17. Chlorine =35.5

18. Argon =36

19. Potassium =40 approx.

20. Calcium =40