118 elements · CIAAW 2024 atomic weights

Periodic table of elements

Every element has its own page with atomic weight, electron configuration, melting and boiling points, density, isotopes, discovery and uses. Tap a symbol below, or open the interactive table to colour it by property and search.

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Alkali metal Alkaline earth metal Transition metal Post-transition metal Metalloid Reactive nonmetal Halogen Noble gas Lanthanide Actinide Unknown properties

All 118 elements

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Z	Symbol	Name	Atomic weight	Category	State	Melting °C	Boiling °C	Density	Electronegativity	Discovered
1	H	Hydrogen	1.0080	Reactive nonmetal	Gas	-259.2	-252.9	0.0899 g/L	2.2	1766
2	He	Helium	4.0026	Noble gas	Gas	—	-268.9	0.1786 g/L	—	1895
3	Li	Lithium	6.94	Alkali metal	Solid	180.5	1,342	0.534 g/cm³	0.98	1817
4	Be	Beryllium	9.0122	Alkaline earth metal	Solid	1,287	2,468	1.85 g/cm³	1.57	1798
5	B	Boron	10.81	Metalloid	Solid	2,077	4,000	2.34 g/cm³	2.04	1808
6	C	Carbon	12.011	Reactive nonmetal	Solid	—	3,641.8	2.2 g/cm³	2.55	ancient
7	N	Nitrogen	14.007	Reactive nonmetal	Gas	-210	-195.8	1.2506 g/L	3.04	1772
8	O	Oxygen	15.999	Reactive nonmetal	Gas	-218.8	-183	1.429 g/L	3.44	1771
9	F	Fluorine	18.998	Halogen	Gas	-219.7	-188.1	1.696 g/L	3.98	1886
10	Ne	Neon	20.180	Noble gas	Gas	-248.6	-246	0.9002 g/L	—	1898
11	Na	Sodium	22.990	Alkali metal	Solid	97.8	882.9	0.97 g/cm³	0.93	1807
12	Mg	Magnesium	24.305	Alkaline earth metal	Solid	650	1,090	1.74 g/cm³	1.31	1808
13	Al	Aluminum	26.982	Post-transition metal	Solid	660.3	2,519	2.7 g/cm³	1.61	1825
14	Si	Silicon	28.085	Metalloid	Solid	1,414	3,265	2.33 g/cm³	1.9	1824
15	P	Phosphorus	30.974	Reactive nonmetal	Solid	44.2	280.6	1.823 g/cm³	2.19	1669
16	S	Sulfur	32.06	Reactive nonmetal	Solid	115.2	444.6	2.07 g/cm³	2.58	ancient
17	Cl	Chlorine	35.45	Halogen	Gas	-101.5	-34	3.2 g/L	3.16	1774
18	Ar	Argon	39.95	Noble gas	Gas	-189.3	-185.8	1.784 g/L	—	1894
19	K	Potassium	39.098	Alkali metal	Solid	63.5	759	0.89 g/cm³	0.82	1807
20	Ca	Calcium	40.078	Alkaline earth metal	Solid	842	1,484	1.54 g/cm³	1	1808
21	Sc	Scandium	44.956	Transition metal	Solid	1,541	2,836	2.99 g/cm³	1.36	1879
22	Ti	Titanium	47.867	Transition metal	Solid	1,670	3,287	4.506 g/cm³	1.54	1791
23	V	Vanadium	50.942	Transition metal	Solid	1,910	3,407	6 g/cm³	1.63	1801
24	Cr	Chromium	51.996	Transition metal	Solid	1,907	2,671	7.15 g/cm³	1.66	1797
25	Mn	Manganese	54.938	Transition metal	Solid	1,246	2,061	7.3 g/cm³	1.55	1774
26	Fe	Iron	55.845	Transition metal	Solid	1,538	2,861	7.87 g/cm³	1.83	ancient
27	Co	Cobalt	58.933	Transition metal	Solid	1,495	2,927	8.86 g/cm³	1.88	1735
28	Ni	Nickel	58.693	Transition metal	Solid	1,455	2,913	8.9 g/cm³	1.91	1751
29	Cu	Copper	63.546	Transition metal	Solid	1,084.6	2,560	8.96 g/cm³	1.9	ancient
30	Zn	Zinc	65.38	Transition metal	Solid	419.5	907	7.134 g/cm³	1.65	ancient
31	Ga	Gallium	69.723	Post-transition metal	Solid	29.8	2,229	5.91 g/cm³	1.81	1875
32	Ge	Germanium	72.630	Metalloid	Solid	938.3	2,833	5.323 g/cm³	2.01	1886
33	As	Arsenic	74.922	Metalloid	Solid	—	613.9	5.75 g/cm³	2.18	1250
34	Se	Selenium	78.971	Reactive nonmetal	Solid	220.9	685	4.809 g/cm³	2.55	1817
35	Br	Bromine	79.904	Halogen	Liquid	-7.2	58.8	3.103 g/cm³	2.96	1825
36	Kr	Krypton	83.798	Noble gas	Gas	-157.4	-153.4	3.749 g/L	3	1898
37	Rb	Rubidium	85.468	Alkali metal	Solid	39.3	688	1.53 g/cm³	0.82	1861
38	Sr	Strontium	87.62	Alkaline earth metal	Solid	777	1,377	2.64 g/cm³	0.95	1790
39	Y	Yttrium	88.906	Transition metal	Solid	1,522	3,345	4.47 g/cm³	1.22	1794
40	Zr	Zirconium	91.222	Transition metal	Solid	1,854	4,406	6.52 g/cm³	1.33	1789
41	Nb	Niobium	92.906	Transition metal	Solid	2,477	4,741	8.57 g/cm³	1.6	1801
42	Mo	Molybdenum	95.95	Transition metal	Solid	2,622	4,639	10.2 g/cm³	2.16	1778
43	Tc	Technetium	[97]	Transition metal	Solid	2,157	4,262	11 g/cm³	1.9	1937
44	Ru	Ruthenium	101.07	Transition metal	Solid	2,333	4,147	12.1 g/cm³	2.2	1844
45	Rh	Rhodium	102.91	Transition metal	Solid	1,963	3,695	12.4 g/cm³	2.28	1803
46	Pd	Palladium	106.42	Transition metal	Solid	1,554.8	2,963	12 g/cm³	2.2	1802
47	Ag	Silver	107.87	Transition metal	Solid	961.8	2,162	10.5 g/cm³	1.93	ancient
48	Cd	Cadmium	112.41	Transition metal	Solid	321.1	767	8.69 g/cm³	1.69	1817
49	In	Indium	114.82	Post-transition metal	Solid	156.6	2,027	7.31 g/cm³	1.78	1863
50	Sn	Tin	118.71	Post-transition metal	Solid	231.9	2,586	7.287 g/cm³	1.96	ancient
51	Sb	Antimony	121.76	Metalloid	Solid	630.6	1,587	6.68 g/cm³	2.05	ancient
52	Te	Tellurium	127.60	Metalloid	Solid	449.5	988	6.232 g/cm³	2.1	1782
53	I	Iodine	126.90	Halogen	Solid	113.7	184.4	4.933 g/cm³	2.66	1811
54	Xe	Xenon	131.29	Noble gas	Gas	-111.7	-108.1	5.894 g/L	2.6	1898
55	Cs	Cesium	132.91	Alkali metal	Solid	28.5	671	1.873 g/cm³	0.79	1860
56	Ba	Barium	137.33	Alkaline earth metal	Solid	727	1,845	3.51 g/cm³	0.89	1772
57	La	Lanthanum	138.91	Lanthanide	Solid	920	3,464	6.15 g/cm³	1.1	1839
58	Ce	Cerium	140.12	Lanthanide	Solid	799	3,443	6.77 g/cm³	1.12	1803
59	Pr	Praseodymium	140.91	Lanthanide	Solid	931	3,520	6.773 g/cm³	1.13	1885
60	Nd	Neodymium	144.24	Lanthanide	Solid	1,016	3,074	7.01 g/cm³	1.14	1885
61	Pm	Promethium	[145]	Lanthanide	Solid	1,042	2,999.8	7.26 g/cm³	1.13	1945
62	Sm	Samarium	150.36	Lanthanide	Solid	1,072	1,794	7.52 g/cm³	1.17	1879
63	Eu	Europium	151.96	Lanthanide	Solid	822	1,529	5.24 g/cm³	1.2	1896
64	Gd	Gadolinium	157.25	Lanthanide	Solid	1,313	3,273	7.9 g/cm³	1.2	1880
65	Tb	Terbium	158.93	Lanthanide	Solid	1,359	3,230	8.23 g/cm³	1.1	1843
66	Dy	Dysprosium	162.50	Lanthanide	Solid	1,412	2,567	8.55 g/cm³	1.22	1886
67	Ho	Holmium	164.93	Lanthanide	Solid	1,472	2,700	8.8 g/cm³	1.23	1878
68	Er	Erbium	167.26	Lanthanide	Solid	1,529	2,868	9.07 g/cm³	1.24	1843
69	Tm	Thulium	168.93	Lanthanide	Solid	1,545	1,950	9.321 g/cm³	1.25	1879
70	Yb	Ytterbium	173.05	Lanthanide	Solid	824	1,196	6.9 g/cm³	1.1	1878
71	Lu	Lutetium	174.97	Lanthanide	Solid	1,663	3,402	9.84 g/cm³	1.27	1907
72	Hf	Hafnium	178.49	Transition metal	Solid	2,233	4,600	13.3 g/cm³	1.3	1923
73	Ta	Tantalum	180.95	Transition metal	Solid	3,017	5,455	16.4 g/cm³	1.5	1802
74	W	Tungsten	183.84	Transition metal	Solid	3,422	5,930	19.3 g/cm³	2.36	1783
75	Re	Rhenium	186.21	Transition metal	Solid	3,185	5,590	20.8 g/cm³	1.9	1925
76	Os	Osmium	190.23	Transition metal	Solid	3,033	5,008	22.587 g/cm³	2.2	1803
77	Ir	Iridium	192.22	Transition metal	Solid	2,446	4,428	22.562 g/cm³	2.2	1803
78	Pt	Platinum	195.08	Transition metal	Solid	1,768.2	3,825	21.5 g/cm³	2.28	1748
79	Au	Gold	196.97	Transition metal	Solid	1,064.2	2,836	19.3 g/cm³	2.54	ancient
80	Hg	Mercury	200.59	Transition metal	Liquid	-38.8	356.6	13.534 g/cm³	2	ancient
81	Tl	Thallium	204.38	Post-transition metal	Solid	304	1,473	11.8 g/cm³	1.62	1861
82	Pb	Lead	207.2	Post-transition metal	Solid	327.5	1,749	11.3 g/cm³	2.33	ancient
83	Bi	Bismuth	208.98	Post-transition metal	Solid	271.4	1,564	9.79 g/cm³	2.02	1500
84	Po	Polonium	[209]	Post-transition metal	Solid	254	962	9.2 g/cm³	2	1898
85	At	Astatine	[210]	Halogen	Solid	302	—	7 g/cm³	2.2	1940
86	Rn	Radon	[222]	Noble gas	Gas	-71	-61.7	9.73 g/L	2.2	1899
87	Fr	Francium	[223]	Alkali metal	Solid	21	—	1.87 g/cm³	0.7	1939
88	Ra	Radium	[226]	Alkaline earth metal	Solid	696	1,736.8	5 g/cm³	0.9	1898
89	Ac	Actinium	[227]	Actinide	Solid	1,050	3,200	10 g/cm³	1.1	1899
90	Th	Thorium	232.04	Actinide	Solid	1,750	4,785	11.7 g/cm³	1.3	1828
91	Pa	Protactinium	231.04	Actinide	Solid	1,572	—	15.4 g/cm³	1.5	1913
92	U	Uranium	238.03	Actinide	Solid	1,135	4,131	19.1 g/cm³	1.38	1789
93	Np	Neptunium	[237]	Actinide	Solid	644	—	20.2 g/cm³	1.36	1940
94	Pu	Plutonium	[244]	Actinide	Solid	640	3,228	19.7 g/cm³	1.28	1940
95	Am	Americium	[243]	Actinide	Solid	1,176	—	12 g/cm³	1.3	1944
96	Cm	Curium	[247]	Actinide	Solid	1,345	—	13.51 g/cm³	1.3	1944
97	Bk	Berkelium	[247]	Actinide	Solid	986	—	14.78 g/cm³	1.3	1949
98	Cf	Californium	[251]	Actinide	Solid	900	—	15.1 g/cm³	1.3	1950
99	Es	Einsteinium	[252]	Actinide	Solid	860	—	8.84 g/cm³	1.3	1952
100	Fm	Fermium	[257]	Actinide	Solid	1,527	—	9.7 g/cm³	1.3	1952
101	Md	Mendelevium	[258]	Actinide	Solid	827	—	10.3 g/cm³	1.3	1955
102	No	Nobelium	[259]	Actinide	Solid	827	—	9.9 g/cm³	1.3	1966
103	Lr	Lawrencium	[266]	Actinide	Solid	1,627	—	15.6 g/cm³	1.3	1961
104	Rf	Rutherfordium	[267]	Transition metal	Unknown	—	—	23.3 g/cm³	—	1964
105	Db	Dubnium	[268]	Transition metal	Unknown	—	—	29.3 g/cm³	—	1968
106	Sg	Seaborgium	[269]	Transition metal	Unknown	—	—	35 g/cm³	—	1974
107	Bh	Bohrium	[270]	Transition metal	Unknown	—	—	37.1 g/cm³	—	1981
108	Hs	Hassium	[269]	Transition metal	Unknown	—	—	40.7 g/cm³	—	1984
109	Mt	Meitnerium	[278]	Unknown properties	Unknown	—	—	37.4 g/cm³	—	1982
110	Ds	Darmstadtium	[281]	Unknown properties	Unknown	—	—	34.8 g/cm³	—	1994
111	Rg	Roentgenium	[282]	Unknown properties	Unknown	—	—	28.7 g/cm³	—	1994
112	Cn	Copernicium	[285]	Unknown properties	Unknown	—	—	14 g/cm³	—	1996
113	Nh	Nihonium	[286]	Unknown properties	Unknown	—	—	16 g/cm³	—	2004
114	Fl	Flerovium	[290]	Unknown properties	Unknown	—	—	9.928 g/cm³	—	1998
115	Mc	Moscovium	[290]	Unknown properties	Unknown	—	—	13.5 g/cm³	—	2003
116	Lv	Livermorium	[293]	Unknown properties	Unknown	—	—	12.9 g/cm³	—	2000
117	Ts	Tennessine	[294]	Unknown properties	Unknown	—	—	7.2 g/cm³	—	2010
118	Og	Oganesson	[294]	Unknown properties	Unknown	—	—	7 g/cm³	—	2002