Question

Atomic number and atomic weight of first 20 elements

Answer 1

atoms and atomic number
H= 1
He =2
Li=3
Be =4
B=5
C=6
N=7
O=8
F=9
Ne=10
Na=11
Mg=12
Al=13
Si=14
P=15
S=16
Cl=17
Ar=18
K=19
Ca=20

Answer 2

1. Hydrogen
2. Helium
3. Lithium
4. Beryllium
5.boron
6. Carbon
7. Nitrogen
8 oxygen
9 flourine
10. Neon
11. Sodium
12. Magnesium
13. Aluminum
14. Silicon
15. Phosphorus
16. Sulphur
17. Chlorine
18. Argon
19. Potassium
20. Calcium