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Element density guide

Atomic weight says how heavy one atom is. Density says how heavy the stuff is: what a sugar-cube-sized block of each element would weigh. This guide ranks every element with a measured density on one scale.

Osmium is about 250,000 times Hydrogen at the same measure. Densities are from PubChem (US National Library of Medicine), which cites Jefferson Lab for them. Elements from californium onwards have never been made in amounts large enough to weigh and are left out.

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

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.

Every element in detail

Commonly confused

Pairs people argue about, and what the figures say.

Elements, Weighed

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

The chart on this page, printed properly.

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