System No. Element
1 Rare Gases
2 Hydrogen
3 Oxygen
4 Nitrogen
5 Fluorine
6 Chlorine
7 Bromine
8 Iodine
8a Astatine
9 Sulfur
10 Selenium
11 Tellurium
12 Polonium and isotopes
13 Boron
14 Carbon
15 Silicon
16 Phosphorus
17 Arsenic
18 Antimony
19 Bismuth and isotopes
20 Lithium
21 Sodium
22 Potassium
23 Ammonium
24 Rubidium
25 Cesium
25a Francium
26 Beryllium
27 Magnesium
28 Calcium
29 Strontium
30 Barium
31 Radium and isotopes
32 Zinc
33 Cadmium
34 Mercury
35 Aluminum
36 Gallium
37 Indium
38 Thallium and isotopes
39 Rare Earths
40 Actinium and isotopes
41 Titanium
42 Zirconium
43 Hafnium
44 Thorium and isotopes
45 Germanium
46 Tin
47 Lead and isotopes
48 Vanadium
49 Niobium
50 Tantalum
51 Protactinium and isotopes
52 Chromium
53 Molybdenum
54 Tungsten
55 Uranium and isotopes
56 Manganese
57 Nickel
58 Cobalt
59 Iron
60 Copper
61 Silver
62 Gold
63 Ruthenium
64 Rhodium
65 Palladium
66 Osmium
67 Iridium
68 Plastinum
69 Technetium
70 Rhenium
71 Transuranium elements