Question

write the symbols of elements from one to twenty

Answer 1

H
He
Li
Be
B
C
N
O
F
Ne
Na
Mg
Al
Si
P
S
Cl
Ar
K
Ca

Answer 2

First 20 elements of long form of periodic table:
1. Hydrogen - H
2. Helium - He
3. Lithium - Li
4. Berelium - 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. Aluminium - Al
14. Silicon - Si
15. Phosphorus - P
16. Sulphur - S
17. Chlorine - Cl
18. Argon - Ar
19. Potassium - K
20. Calcium - Ca