List of elements by density

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This is a list of the chemical elements, sorted by density measured at standard temperature and pressure. (The first elements from hydrogen to radon are gases at normal room temperatures.)

Name	Symbol	Density (g/cm³)	Atomic number	Description/Mohs' hardness	Color	Notes
Hydrogen	H	0.00008988	1	gas		diatomic
Helium	He	0.0001785	2	gas		lowest boiling and melting pts
Neon	Ne	0.0008999	10	noble gas
Nitrogen	N	0.0012506	7	gas		diatomic
Oxygen	O	0.001429	8	gas		diatomic
Fluorine	F	0.001696	9	halogen gas	yellow-green or yellowish brown
Argon	Ar	0.0017837	18	noble gas
Chlorine	Cl	0.003214	17	halogen gas	yellowish green or greenish yellow
Krypton	Kr	0.003733	36	noble gas		forms compounds with fluorine and clathrates with water
Xenon	Xe	0.005887	54	noble gas
Radon	Rn	0.00973	86	noble gas		radioactive, comes from radium
Lithium	Li	0.534	3	0.6	silvery white/gray	use it in batteries
Potassium	K	0.862	19	0.4	silvery white	forms lots of compounds
Sodium	Na	0.971	11	0.5	waxy, silvery white	burns with a yellow flame, reacts violently with water and oxidizes in air necessitating storage in an inert environment
Rubidium	Rb	1.532	37	0.3	silvery-white
Calcium	Ca	1.54	20	1.75	gray
Magnesium	Mg	1.738	12	2.5	silvery metallic	is very brittle
Phosphorus	P	1.82	15	nonmetal	waxy white/ red/ black/ colorless	Due to its high reactivity, it is never found as a free element in nature.
Beryllium	Be	1.85	4	brittle 5.5	gray metallic
Francium	Fr	1.87	87	radioactive alkali metal		alkali metal isotope found in uranium and thorium ores
Caesium	Cs	1.873	55	0.2	silvery gold	liquid at or near room temperature.
Sulfur	S	2.067	16	2.0	lemon yellow
Carbon	C	2.267	6	(graphite) 1-2 (diamond) 10.0	black or colorless when diamond
Silicon	Si	2.3296	14	metalloid	dark gray, bluish tinge
Boron	B	2.34	5	9.3	black/brown/ amorphous boron is a brown powder, metallic boron is black.	The metallic form is hard (9.3 on Mohs' scale) and a poor conductor at room temperature.
Strontium	Sr	2.64	38	1.5	a soft silver-white or yellowish metallic element	The metal turns yellow when exposed to air. somewhat malleable. It is chiefly employed (as in the nitrate) to color pyrotechnic flames red.
Aluminium	Al	2.698	13	2.75	silvery	non-magnetic, high reflectance
Scandium	Sc	2.989	21	transition metal	soft, silvery, develops a slightly yellowish or pinkish cast when exposed to air.	not attacked by a 1:1 mixture of nitric acid(HNO3) and 48% HF
Bromine	Br	3.122	35	halogen	gas/liquid: red-brown solid: metallic luster	a red volatile liquid at standard room temperature. This element is corrosive to human tissue
Barium	Ba	3.594	56	1.25	metallic	Naturally occurring barium is a mix of seven stable isotopes. There are twenty-two isotopes known, but most of these are highly radioactive and have half-lifes in the several millisecond to several minute range. The only notable exceptions are 133Ba which has a half-life of 10.51 years, and 137mBa (2.6 minutes).
Yttrium	Y	4.469	39	transition metal	silvery metallic	two of its compounds are used to make the red color phosphors in cathode ray tube displays
Titanium	Ti	4.540	22	6.0	silvery metallic	corrosion-resistant (including resistance to sea water and chlorine, high tensile strength
Selenium	Se	4.809	34	2.0	gray, metallic luster	Selenium has at least 29 isotopes, of which 5 are stable, and 6 are nuclear isomers.
Iodine	I	4.93	53	halogen solid that sublimes at standard temperatures into a purple-pink gas that has an irritating odor	violet-dark gray, lustrous	least reactive of the halogens
Europium	Eu	5.243	63	lanthanide
Germanium	Ge	5.323	32	6.0
Radium	Ra	5.50	88		almost pure white, readily oxidizes on exposure to air, turning black	Radium preparations are remarkable for maintaining themselves at a higher temperature than their surroundings, and for their radiations: alpha particles, beta particles, and gamma rays. Radium also produces neutrons when mixed with beryllium.
Arsenic	As	5.776	33	3.5	metallic gray, allotropic forms; yellow, black and grey	poisonous
Gallium	Ga	5.907	31	1.5
Vanadium	V	6.11	23	7.0
Lanthanum	La	6.145	57	2.5
Tellurium	Te	6.232	52	2.25	silvery lustrous gray
Zirconium	Zr	6.506	40	5.0
Antimony	Sb	6.685	51	3.0	silvery lustrous grey
Cerium	Ce	6.770	58	2.5	resembles iron
Praseodymium	Pr	6.773	59	soft	silvery white, yellowish tinge
Ytterbium	Yb	6.965	70
Astatine	At	Approximately 7	85
Neodymium	Nd	7.007	60
Zinc	Zn	7.134	30
Chromium	Cr	7.15	24
Promethium	Pm	7.26	61
Tin	Sn	7.287	50	soft metal
Indium	In	7.310	49	soft metal
Manganese	Mn	7.44	25
Samarium	Sm	7.52	62
Iron	Fe	7.874	26	metal
Gadolinium	Gd	7.895	64
Terbium	Tb	8.229	65
Dysprosium	Dy	8.55	66
Niobium	Nb	8.570	41
Cadmium	Cd	8.69	48
Holmium	Ho	8.795	67
Cobalt	Co	8.86	27
Nickel	Ni	8.912	28
Copper	Cu	8.933	29
Erbium	Er	9.066	68
Polonium	Po	9.32	84
Ununhexium	Uuh	>9.32	116
Thulium	Tm	9.321	69
Bismuth	Bi	9.807	83
Ununpentium	Uup	>9.807	115
Lutetium	Lu	9.84	71
Lawrencium	Lr	>9.84	103
Actinium	Ac	10.07	89		radioactive metallic element. glows in the dark with an eerie blue light.
Molybdenum	Mo	10.22	42
Silver	Ag	10.501	47
Lead	Pb	11.342	82
Ununquadium	Uuq	>11.342	114
Technetium	Tc	11.50	43
Thorium	Th	11.72	90
Thallium	Tl	11.85	81
Ununtrium	Uut	>11.85	113
Palladium	Pd	12.020	46
Ruthenium	Ru	12.37	44
Rhodium	Rh	12.41	45
Hafnium	Hf	13.31	72
Einsteinium	Es	13.5 (Estimate)	99
Curium	Cm	13.51	96
Mercury	Hg	13.5336	80
Ununbium	Uub	>13.5336	112
Americium	Am	13.69	95
Berkelium	Bk	14.79	97
Californium	Cf	15.10	98
Protactinium	Pa	15.37	91
Tantalum	Ta	16.654	73
Rutherfordium	Rf	18.1	104
Uranium	U	18.95	92
Tungsten	W	19.25	74
Gold	Au	19.282	79
Roentgenium	Rg	>19.282	111
Plutonium	Pu	19.84	94
Neptunium	Np	20.25	93
Rhenium	Re	21.02	75
Platinum	Pt	21.46	78
Darmstadtium	Ds	>21.46	110
Osmium	Os	22.610	76
Iridium	Ir	22.650	77
Seaborgium	Sg	35 (Estimate)	106
Meitnerium	Mt	35 (Estimate)	109
Bohrium	Bh	37 (Estimate)	107
Dubnium	Db	39 (Estimate)	105
Hassium	Hs	41 (Estimate)	108
Fermium	Fm	Unknown	100
Mendelevium	Md	Unknown	101
Nobelium	No	Unknown	102
Ununoctium	Uuo	Unknown	118