Atomic number

Number of protons in the nucleus of an atom of each element. Defines the element’s identity and its place in the periodic table.

Data completeness Protons 118 of 118

Showing 118 of 118 elements

	Symbol	Name
1	H	Hydrogen	1
2	He	Helium	2
3	Li	Lithium	3
4	Be	Beryllium	4
5	B	Boron	5
6	C	Carbon	6
7	N	Nitrogen	7
8	O	Oxygen	8
9	F	Fluorine	9
10	Ne	Neon	10
11	Na	Sodium	11
12	Mg	Magnesium	12
13	Al	Aluminum	13
14	Si	Silicon	14
15	P	Phosphorus	15
16	S	Sulfur	16
17	Cl	Chlorine	17
18	Ar	Argon	18
19	K	Potassium	19
20	Ca	Calcium	20
21	Sc	Scandium	21
22	Ti	Titanium	22
23	V	Vanadium	23
24	Cr	Chromium	24
25	Mn	Manganese	25
26	Fe	Iron	26
27	Co	Cobalt	27
28	Ni	Nickel	28
29	Cu	Copper	29
30	Zn	Zinc	30
31	Ga	Gallium	31
32	Ge	Germanium	32
33	As	Arsenic	33
34	Se	Selenium	34
35	Br	Bromine	35
36	Kr	Krypton	36
37	Rb	Rubidium	37
38	Sr	Strontium	38
39	Y	Yttrium	39
40	Zr	Zirconium	40
41	Nb	Niobium	41
42	Mo	Molybdenum	42
43	Tc	Technetium	43
44	Ru	Ruthenium	44
45	Rh	Rhodium	45
46	Pd	Palladium	46
47	Ag	Silver	47
48	Cd	Cadmium	48
49	In	Indium	49
50	Sn	Tin	50
51	Sb	Antimony	51
52	Te	Tellurium	52
53	I	Iodine	53
54	Xe	Xenon	54
55	Cs	Cesium	55
56	Ba	Barium	56
57	La	Lanthanum	57
58	Ce	Cerium	58
59	Pr	Praseodymium	59
60	Nd	Neodymium	60
61	Pm	Promethium	61
62	Sm	Samarium	62
63	Eu	Europium	63
64	Gd	Gadolinium	64
65	Tb	Terbium	65
66	Dy	Dysprosium	66
67	Ho	Holmium	67
68	Er	Erbium	68
69	Tm	Thulium	69
70	Yb	Ytterbium	70
71	Lu	Lutetium	71
72	Hf	Hafnium	72
73	Ta	Tantalum	73
74	W	Tungsten	74
75	Re	Rhenium	75
76	Os	Osmium	76
77	Ir	Iridium	77
78	Pt	Platinum	78
79	Au	Gold	79
80	Hg	Mercury	80
81	Tl	Thallium	81
82	Pb	Lead	82
83	Bi	Bismuth	83
84	Po	Polonium	84
85	At	Astatine	85
86	Rn	Radon	86
87	Fr	Francium	87
88	Ra	Radium	88
89	Ac	Actinium	89
90	Th	Thorium	90
91	Pa	Protactinium	91
92	U	Uranium	92
93	Np	Neptunium	93
94	Pu	Plutonium	94
95	Am	Americium	95
96	Cm	Curium	96
97	Bk	Berkelium	97
98	Cf	Californium	98
99	Es	Einsteinium	99
100	Fm	Fermium	100
101	Md	Mendelevium	101
102	No	Nobelium	102
103	Lr	Lawrencium	103
104	Rf	Rutherfordium	104
105	Db	Dubnium	105
106	Sg	Seaborgium	106
107	Bh	Bohrium	107
108	Hs	Hassium	108
109	Mt	Meitnerium	109
110	Ds	Darmstadtium	110
111	Rg	Roentgenium	111
112	Cn	Copernicium	112
113	Nh	Nihonium	113
114	Fl	Flerovium	114
115	Mc	Moscovium	115
116	Lv	Livermorium	116
117	Ts	Tennessine	117
118	Og	Oganesson	118