Question

what is a periodic table of element till 20

Answer 1

1 Hydrogen H
2 Helium He
3 Lithium Li
4 Beryllium Be
5 Boron B
6 Carbon C
7 Nitrogen N
8 Oxygen O
9 Fluorine F
10 Neon Ne
11 Sodium Na
12 Magnesium Mg
13 Aluminum Al
14 Silicon Si
15 Phosphorus P
16 Sulfur S
17 Chlorine Cl
18 Argon Ar
19 Potassium K
20 Calcium

Answer 2

1. Hydrogen, H
2. Helium, He
3. Lithium, Li
4. Beryllium, Be
5. Boron, B
6. Carbon, C
7. Nitrogen, N
8. Oxygen, O
9. Flourine, F
10. Neon, Ne
11. Sodium, Na
12. Magnesium, Mg
13. Aluminium, Al
14. Silicon, Si
15. Phosphorus, P
16. Sulphur, S
17. Chlorine, Cl
18. Argon, Ar
19. Potassium, K
20. Calcium, Ca