most used atomic weight
O oxygen
16
H hydrogen
1
Ca calcium
40
He helium
4
Cl chlorine
35.5
Na sodium
23
S sulfur
32
K potassium
39
Zn zinc
65
C carbon
12
Mg Magnesium
24
P phosphorus
31
Ba Barium
137
C carbon
12
F flourine
19
Si Silicon
28
P phosphorous
31
Fe Iron
56