13
Al
14
Si
15
P
16
S
17
Cl
18
Ar
22.99
sodium
24.31
magnesium
3A
4A
5A
6A
7A
8
1B
2B
26.98
aluminum
28.09
silicon
30.97
phosphorus
32.06
sulfur
35.45
chlorine
39.95
argon
19
K
20
Ca
21
Sc
22
Ti
23
V
24
Cr
25
Mn
26
Fe
27
Co
28
Ni
29
Cu
30
Zn
31
Ga
32
Ge
33
As
34
Se
35
Br
36
Kr
39.10
potassium
40.08
calcium
44.96
scandium
47.90
tit
....