Roles of chemical elements

This table is designed to show the role(s) performed by each chemical element, in nature and in technology.

Z = Atomic number Sym. = Symbol Per. = Period Gr. = Group

Z	Sym.	Element	Per.	Gr.	Role(s) in nature (non-living and living)	Role(s) in technology (old and new)
1	H	Hydrogen	1	1	Astronomy: source of power by nuclear fusion (proton–proton chain reaction and CNO cycle) Biology: One of the most common elements in living organisms	Petrochemical industry: hydrodealkylation, hydrodesulfurization Various industries: hydrogenation
2	He	Helium	1	18	Astronomy: source of power by nuclear fusion (alpha process and triple-alpha process)	Various industries: cryogenics, pressurization, controlled atmosphere, welding
3	Li	Lithium	2	1		Ceramics and glass: flux, component of ovenware Electricity and electronics: batteries Various industries: lubricating greases
4	Be	Beryllium	2	2		Radiography: radiation windows Aeronautics and astronautics: lightweight structural components
5	B	Boron	2	13		Ceramics and glass: borosilicate glass Cleaning products: detergents and bleaches Insecticides: boric acid Electronics: semiconductors
6	C	Carbon	2	14	Biology: One of the most common elements in living organisms See also: Carbon-based life	Fossil fuels: coal, methane and petroleum Textile industry: cellulose Metallurgy: alloys, especially carbon steel
7	N	Nitrogen	2	15	Bacteria and archaea: nitrogen fixation by diazotrophs All forms of life on Earth: essential component of amino acids and of nucleic acids Earth's atmosphere, soil, and life forms: nitrogen cycle See also: CHON.	Chemical industry: nitrogen fixation by the Haber process Astronautics: nitric acid and hydrazine
8	O	Oxygen	2	16	Animals: inhaled in respiration Plants: exhaled in respiration; Biology: one of the most common elements in living organisms	Metallurgy: smelting of iron ore into steel Chemical industry: ethylene + O₂ —> ethylene oxide —> ethylene glycol —> many products Medicine Water treatment
9	F	Fluorine	2	17		Various industries: fluorocarbons and derivatives as refrigerants and as anaesthetics Aluminium production: cryolite as solvent
10	Ne	Neon	2	18		Signage: neon signs Electronics: vacuum tubes
11	Na	Sodium	3	1	See also: Sodium in biology.
12	Mg	Magnesium	3	2	All life forms: essential catalyst for using and making DNA and RNA Plants: photosynthesis See also: Magnesium in biology.	Metallurgy: aluminium alloys, production of iron, steel, and titanium Automotive industry: lightweight components Electronics
13	Al	Aluminium	3	13
14	Si	Silicon	3	14	Earth's crust: silicate minerals Diatoms, radiolaria, and siliceous sponges: biogenic silica as a structural material	Construction: Portland cement, concrete Electronics: semiconductors
15	P	Phosphorus	3	15	Biology: structure of DNA and RNA part of adenosine triphosphate (ATP) structure of bones and teeth	Agriculture: fertilizers
16	S	Sulfur	3	16	Biology: part of the amino acids cysteine and methionine, and of all polypeptides, proteins, and enzymes that contain them See also: Sulfur assimilation.	Agriculture: fertilizers, fungicides, and pesticides
17	Cl	Chlorine	3	17
18	Ar	Argon	3	18
19	K	Potassium	4	1	Animals: neuron function, electrolyte balance See also: Potassium in biology.	Agriculture: fertilizers
20	Ca	Calcium	4	2	Animals: structure of bones and teeth See also: Calcium in biology.	Construction: cements and mortars
21	Sc	Scandium	4	3
22	Ti	Titanium	4	4
23	V	Vanadium	4	5
24	Cr	Chromium	4	6
25	Mn	Manganese	4	7
26	Fe	Iron	4	8
27	Co	Cobalt	4	9
28	Ni	Nickel	4	10
29	Cu	Copper	4	11	See also: Copper in health.
30	Zn	Zinc	4	12
31	Ga	Gallium	4	13
32	Ge	Germanium	4	14
33	As	Arsenic	4	15	See also: Arsenic biochemistry.
34	Se	Selenium	4	16
35	Br	Bromine	4	17
36	Kr	Krypton	4	18
37	Rb	Rubidium	5	1
38	Sr	Strontium	5	2
39	Y	Yttrium	5	3
40	Zr	Zirconium	5	4
41	Nb	Niobium	5	5
42	Mo	Molybdenum	5	6
43	Tc	Technetium	5	7
44	Ru	Ruthenium	5	8
45	Rh	Rhodium	5	9
46	Pd	Palladium	5	10
47	Ag	Silver	5	11
48	Cd	Cadmium	5	12
49	In	Indium	5	13
50	Sn	Tin	5	14
51	Sb	Antimony	5	15
52	Te	Tellurium	5	16
53	I	Iodine	5	17	See also: Iodine in biology.
54	Xe	Xenon	5	18
55	Cs	Caesium	6	1
56	Ba	Barium	6	2
57	La	Lanthanum	6	3
58	Ce	Cerium	6	3
59	Pr	Praseodymium	6	3
60	Nd	Neodymium	6	3
61	Pm	Promethium	6	3
62	Sm	Samarium	6	3
63	Eu	Europium	6	3
64	Gd	Gadolinium	6	3
65	Tb	Terbium	6	3
66	Dy	Dysprosium	6	3
67	Ho	Holmium	6	3
68	Er	Erbium	6	3
69	Tm	Thulium	6	3
70	Yb	Ytterbium	6	3
71	Lu	Lutetium	6	3
72	Hf	Hafnium	6	4
73	Ta	Tantalum	6	5
74	W	Tungsten	6	6
75	Re	Rhenium	6	7
76	Os	Osmium	6	8
77	Ir	Iridium	6	9
78	Pt	Platinum	6	10
79	Au	Gold	6	11
80	Hg	Mercury	6	12
81	Tl	Thallium	6	13
82	Pb	Lead	6	14
83	Bi	Bismuth	6	15
84	Po	Polonium	6	16
85	At	Astatine	6	17
86	Rn	Radon	6	18
87	Fr	Francium	7	1
88	Ra	Radium	7	2
89	Ac	Actinium	7	3
90	Th	Thorium	7	3
91	Pa	Protactinium	7	3
92	U	Uranium	7	3
93	Np	Neptunium	7	3
94	Pu	Plutonium	7	3
95	Am	Americium	7	3
96	Cm	Curium	7	3
97	Bk	Berkelium	7	3
98	Cf	Californium	7	3
99	Es	Einsteinium	7	3
100	Fm	Fermium	7	3
101	Md	Mendelevium	7	3
102	No	Nobelium	7	3
103	Lr	Lawrencium	7	3
104	Rf	Rutherfordium	7	4
105	Db	Dubnium	7	5
106	Sg	Seaborgium	7	6
107	Bh	Bohrium	7	7
108	Hs	Hassium	7	8
109	Mt	Meitnerium	7	9
110	Ds	Darmstadtium	7	10
111	Rg	Roentgenium	7	11
112	Cn	Copernicium	7	12
113	Nh	Nihonium	7	13
114	Fl	Flerovium	7	14
115	Mc	Moscovium	7	15
116	Lv	Livermorium	7	16
117	Ts	Tennessine	7	17
118	Og	Oganesson	7	18

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