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Hydrogen

Hydrogen is the least dense of the 96 elements here. At 8.988e-05 g/cm³ it is about 50% of Helium, and a tiny fraction of Osmium, the densest here.

Symbol	H
Atomic number	1
Atomic weight	1.008
Density	8.988e-05 g/cm³
Standard state	Gas
Group	Nonmetal

Data: PubChem, US National Library of Medicine (pubchem.ncbi.nlm.nih.gov); densities and atomic weights as cited there from Jefferson Lab, US Department of Energy. Licensed under Public domain (US government work). Changes: Densities drawn to scale, gases in scientific notation to two figures; elements with no standard atomic weight shown as [mass number]. Checked 2026-09-19.

Figures for this entry: source record.

How it sits against the others

Element	Symbol	Atomic number	Atomic weight	Density	Standard state	Group
Osmium	Os	76	190.23	22.57 g/cm³	Solid	Transition metal
Iridium	Ir	77	192.217	22.42 g/cm³	Solid	Transition metal
Platinum	Pt	78	195.084	21.46 g/cm³	Solid	Transition metal
Rhenium	Re	75	186.207	20.8 g/cm³	Solid	Transition metal
Neptunium	Np	93	[237]	20.25 g/cm³	Solid	Actinide
Plutonium	Pu	94	[244]	19.84 g/cm³	Solid	Actinide
Tungsten	W	74	183.84	19.3 g/cm³	Solid	Transition metal
Gold	Au	79	196.967	19.282 g/cm³	Solid	Transition metal
Uranium	U	92	238.029	18.95 g/cm³	Solid	Actinide
Tantalum	Ta	73	180.948	16.4 g/cm³	Solid	Transition metal
Protactinium	Pa	91	231.036	15.37 g/cm³	Solid	Actinide
Berkelium	Bk	97	[247]	14 g/cm³	Solid	Actinide
Americium	Am	95	[243]	13.69 g/cm³	Solid	Actinide
Mercury	Hg	80	200.592	13.5336 g/cm³	Liquid	Transition metal
Curium	Cm	96	[247]	13.51 g/cm³	Solid	Actinide
Hafnium	Hf	72	178.49	13.3 g/cm³	Solid	Transition metal
Rhodium	Rh	45	102.906	12.4 g/cm³	Solid	Transition metal
Ruthenium	Ru	44	101.07	12.1 g/cm³	Solid	Transition metal
Palladium	Pd	46	106.42	12 g/cm³	Solid	Transition metal
Thallium	Tl	81	204.383	11.8 g/cm³	Solid	Post-transition metal
Thorium	Th	90	232.038	11.72 g/cm³	Solid	Actinide
Lead	Pb	82	207.2	11.342 g/cm³	Solid	Post-transition metal
Technetium	Tc	43	[97]	11 g/cm³	Solid	Transition metal
Silver	Ag	47	107.868	10.501 g/cm³	Solid	Transition metal
Molybdenum	Mo	42	95.95	10.2 g/cm³	Solid	Transition metal
Actinium	Ac	89	[227]	10.07 g/cm³	Solid	Actinide
Lutetium	Lu	71	174.967	9.84 g/cm³	Solid	Lanthanide
Bismuth	Bi	83	208.98	9.807 g/cm³	Solid	Post-transition metal
Thulium	Tm	69	168.934	9.32 g/cm³	Solid	Lanthanide
Polonium	Po	84	[209]	9.32 g/cm³	Solid	Metalloid
Erbium	Er	68	167.259	9.07 g/cm³	Solid	Lanthanide
Copper	Cu	29	63.546	8.933 g/cm³	Solid	Transition metal
Nickel	Ni	28	58.693	8.912 g/cm³	Solid	Transition metal
Cobalt	Co	27	58.933	8.86 g/cm³	Solid	Transition metal
Holmium	Ho	67	164.93	8.8 g/cm³	Solid	Lanthanide
Cadmium	Cd	48	112.414	8.69 g/cm³	Solid	Transition metal
Niobium	Nb	41	92.906	8.57 g/cm³	Solid	Transition metal
Dysprosium	Dy	66	162.500	8.55 g/cm³	Solid	Lanthanide
Terbium	Tb	65	158.925	8.23 g/cm³	Solid	Lanthanide
Gadolinium	Gd	64	157.25	7.9 g/cm³	Solid	Lanthanide
Iron	Fe	26	55.845	7.874 g/cm³	Solid	Transition metal
Samarium	Sm	62	150.36	7.52 g/cm³	Solid	Lanthanide
Indium	In	49	114.818	7.31 g/cm³	Solid	Post-transition metal
Manganese	Mn	25	54.938	7.3 g/cm³	Solid	Transition metal
Tin	Sn	50	118.710	7.287 g/cm³	Solid	Post-transition metal
Promethium	Pm	61	[145]	7.26 g/cm³	Solid	Lanthanide
Chromium	Cr	24	51.996	7.15 g/cm³	Solid	Transition metal
Zinc	Zn	30	65.38	7.134 g/cm³	Solid	Transition metal
Neodymium	Nd	60	144.242	7.01 g/cm³	Solid	Lanthanide
Astatine	At	85	[210]	7 g/cm³	Solid	Halogen
Ytterbium	Yb	70	173.045	6.9 g/cm³	Solid	Lanthanide
Cerium	Ce	58	140.116	6.77 g/cm³	Solid	Lanthanide
Praseodymium	Pr	59	140.908	6.77 g/cm³	Solid	Lanthanide
Antimony	Sb	51	121.760	6.685 g/cm³	Solid	Metalloid
Zirconium	Zr	40	91.224	6.52 g/cm³	Solid	Transition metal
Tellurium	Te	52	127.60	6.232 g/cm³	Solid	Metalloid
Lanthanum	La	57	138.905	6.15 g/cm³	Solid	Lanthanide
Vanadium	V	23	50.941	6 g/cm³	Solid	Transition metal
Gallium	Ga	31	69.723	5.91 g/cm³	Solid	Post-transition metal
Arsenic	As	33	74.922	5.776 g/cm³	Solid	Metalloid
Germanium	Ge	32	72.630	5.323 g/cm³	Solid	Metalloid
Europium	Eu	63	151.964	5.24 g/cm³	Solid	Lanthanide
Radium	Ra	88	[226]	5 g/cm³	Solid	Alkaline earth metal
Iodine	I	53	126.904	4.93 g/cm³	Solid	Halogen
Selenium	Se	34	78.971	4.809 g/cm³	Solid	Nonmetal
Titanium	Ti	22	47.867	4.5 g/cm³	Solid	Transition metal
Yttrium	Y	39	88.906	4.47 g/cm³	Solid	Transition metal
Barium	Ba	56	137.327	3.62 g/cm³	Solid	Alkaline earth metal
Bromine	Br	35	79.904	3.11 g/cm³	Liquid	Halogen
Scandium	Sc	21	44.956	2.99 g/cm³	Solid	Transition metal
Aluminum	Al	13	26.982	2.7 g/cm³	Solid	Post-transition metal
Strontium	Sr	38	87.62	2.64 g/cm³	Solid	Alkaline earth metal
Boron	B	5	10.811	2.37 g/cm³	Solid	Metalloid
Silicon	Si	14	28.085	2.3296 g/cm³	Solid	Metalloid
Carbon	C	6	12.011	2.267 g/cm³	Solid	Nonmetal
Sulfur	S	16	32.066	2.067 g/cm³	Solid	Nonmetal
Cesium	Cs	55	132.905	1.93 g/cm³	Solid	Alkali metal
Beryllium	Be	4	9.012	1.85 g/cm³	Solid	Alkaline earth metal
Phosphorus	P	15	30.974	1.82 g/cm³	Solid	Nonmetal
Magnesium	Mg	12	24.305	1.74 g/cm³	Solid	Alkaline earth metal
Calcium	Ca	20	40.078	1.54 g/cm³	Solid	Alkaline earth metal
Rubidium	Rb	37	85.468	1.53 g/cm³	Solid	Alkali metal
Sodium	Na	11	22.99	0.97 g/cm³	Solid	Alkali metal
Potassium	K	19	39.098	0.89 g/cm³	Solid	Alkali metal
Lithium	Li	3	6.941	0.534 g/cm³	Solid	Alkali metal
Radon	Rn	86	[222]	0.00973 g/cm³	Gas	Noble gas
Xenon	Xe	54	131.293	0.005887 g/cm³	Gas	Noble gas
Krypton	Kr	36	83.798	0.003733 g/cm³	Gas	Noble gas
Chlorine	Cl	17	35.453	0.003214 g/cm³	Gas	Halogen
Argon	Ar	18	39.948	0.0017837 g/cm³	Gas	Noble gas
Fluorine	F	9	18.998	0.001696 g/cm³	Gas	Halogen
Oxygen	O	8	15.999	0.001429 g/cm³	Gas	Nonmetal
Nitrogen	N	7	14.007	0.0012506 g/cm³	Gas	Nonmetal
Neon	Ne	10	20.18	0.0008999 g/cm³	Gas	Noble gas
Helium	He	2	4.003	0.0001785 g/cm³	Gas	Noble gas
Hydrogen	H	1	1.008	8.988e-05 g/cm³	Gas	Nonmetal

Other elements

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Elements, Weighed

The periodic table with every measured density drawn to scale: what one cubic centimetre of each element weighs.

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