A1
Argon
18
Ar
Iron
26
Fe
Xenon
54
Xe
Magnesium
12
Mg
Chlorine
17
Cl
Fluorine
9
F
Aluminum
13
Al
Silver
Ag
Barium
56
Ba
Helium
2
He
Calcium
20
Ca
Zinc
Zn
Tin
50
Sn
Lithium
3
Li
Cesium
55
Cs
Carbon
6
C
Titanium
Ti
Gold
Au
Uranium
92
U
Berylium
4
Be
Silicon
14
Si
Sodium
11
Na
Cobalt
27
Co
Nickel
28
Ni
Krypton
36
Kr