Chemical Elements

Atomic number	Symbol	Name	Atomic mass	State at STP	Density at STP	Discovered
1	H	hydrogen	1.00794(4)	gas	0.0000899	1766
2	He	helium	4.002602(2)	gas	0.0001785	1868
3	Li	lithium	6.941(2)	solid	0.535	1817
4	Be	beryllium	9.012182(3)	solid	1.848	1798
5	B	boron	10.811(7)	solid	2.46	1807
6	C	carbon	12.0107(8)	solid	2.26	Ancient
7	N	nitrogen	14.0067(2)	gas	0.001251	1772
8	O	oxygen	15.9994(3)	gas	0.001429	1774
9	F	fluorine	18.9984032(5)	gas	0.001696	1670
10	Ne	neon	20.1797(6)	gas	0.0009	1898
11	Na	sodium	22.98976928(2)	solid	0.968	1807
12	Mg	magnesium	24.3050(6)	solid	1.738	1808
13	Al	aluminum	26.9815386(8)	solid	2.7	Ancient
14	Si	silicon	28.0855(3)	solid	2.33	1854
15	P	phosphorus	30.973762(2)	solid	1.823	1669
16	S	sulfur	32.065(5)	solid	1.96	Ancient
17	Cl	chlorine	35.453(2)	gas	0.003214	1774
18	Ar	argon	39.948(1)	gas	0.001784	1894
19	K	potassium	39.0983(1)	solid	0.856	1807
20	Ca	calcium	40.078(4)	solid	1.55	Ancient
21	Sc	scandium	44.955912(6)	solid	2.985	1876
22	Ti	titanium	47.867(1)	solid	4.507	1791
23	V	vanadium	50.9415(1)	solid	6.11	1803
24	Cr	chromium	51.9961(6)	solid	7.14	Ancient
25	Mn	manganese	54.938045(5)	solid	7.47	1774
26	Fe	iron	55.845(2)	solid	7.874	Ancient
27	Co	cobalt	58.933195(5)	solid	8.9	Ancient
28	Ni	nickel	58.6934(4)	solid	8.908	1751
29	Cu	copper	63.546(3)	solid	8.92	Ancient
30	Zn	zinc	65.38(2)	solid	7.14	1746
31	Ga	gallium	69.723(1)	solid	5.904	1875
32	Ge	germanium	72.64(1)	solid	5.323	1886
33	As	arsenic	74.92160(2)	solid	5.727	Ancient
34	Se	selenium	78.96(3)	solid	4.819	1817
35	Br	bromine	79.904(1)	liquid	3.12	1826
36	Kr	krypton	83.798(2)	gas	0.00375	1898
37	Rb	rubidium	85.4678(3)	solid	1.532	1861
38	Sr	strontium	87.62(1)	solid	2.63	1790
39	Y	yttrium	88.90585(2)	solid	4.472	1794
40	Zr	zirconium	91.224(2)	solid	6.511	1789
41	Nb	niobium	92.90638(2)	solid	8.57	1801
42	Mo	molybdenum	95.96(2)	solid	10.28	1778
43	Tc	technetium	[98]	solid	11.5	1937
44	Ru	ruthenium	101.07(2)	solid	12.37	1827
45	Rh	rhodium	102.90550(2)	solid	12.45	1803
46	Pd	palladium	106.42(1)	solid	12.023	1803
47	Ag	silver	107.8682(2)	solid	10.49	Ancient
48	Cd	cadmium	112.411(8)	solid	8.65	1817
49	In	indium	114.818(3)	solid	7.31	1863
50	Sn	tin	118.710(7)	solid	7.31	Ancient
51	Sb	antimony	121.760(1)	solid	6.697	Ancient
52	Te	tellurium	127.60(3)	solid	6.24	1782
53	I	iodine	126.90447(3)	solid	4.94	1811
54	Xe	xenon	131.293(6)	gas	0.0059	1898
55	Cs	cesium	132.9054519(2)	solid	1.879	1860
56	Ba	barium	137.327(7)	solid	3.51	1808
57	La	lanthanum	138.90547(7)	solid	6.146	1839
58	Ce	cerium	140.116(1)	solid	6.689	1803
59	Pr	praseodymium	140.90765(2)	solid	6.64	1885
60	Nd	neodymium	144.242(3)	solid	7.01	1885
61	Pm	promethium	[145]	solid	7.264	1947
62	Sm	samarium	150.36(2)	solid	7.353	1853
63	Eu	europium	151.964(1)	solid	5.244	1901
64	Gd	gadolinium	157.25(3)	solid	7.901	1880
65	Tb	terbium	158.92535(2)	solid	8.219	1843
66	Dy	dysprosium	162.500(1)	solid	8.551	1886
67	Ho	holmium	164.93032(2)	solid	8.795	1878
68	Er	erbium	167.259(3)	solid	9.066	1842
69	Tm	thulium	168.93421(2)	solid	9.321	1879
70	Yb	ytterbium	173.054(5)	solid	6.57	1878
71	Lu	lutetium	174.9668(1)	solid	9.841	1907
72	Hf	hafnium	178.49(2)	solid	13.31	1923
73	Ta	tantalum	180.94788(2)	solid	16.65	1802
74	W	tungsten	183.84(1)	solid	19.25	1783
75	Re	rhenium	186.207(1)	solid	21.02	1925
76	Os	osmium	190.23(3)	solid	22.61	1803
77	Ir	iridium	192.217(3)	solid	22.65	1803
78	Pt	platinum	195.084(9)	solid	21.09	Ancient
79	Au	gold	196.966569(4)	solid	19.3	Ancient
80	Hg	mercury	200.59(2)	liquid	13.534	Ancient
81	Tl	thallium	204.3833(2)	solid	11.85	1861
82	Pb	lead	207.2(1)	solid	11.34	Ancient
83	Bi	bismuth	208.98040(1)	solid	9.78	Ancient
84	Po	polonium	[209]	solid	9.196	1898
85	At	astatine	[210]	solid	(unknown)	1940
86	Rn	radon	[222]	gas	0.00973	1900
87	Fr	francium	[223]	solid	(unknown)	1939
88	Ra	radium	[226]	solid	5	1898
89	Ac	actinium	[227]	solid	10.07	1899
90	Th	thorium	232.03806(2)	solid	11.724	1828
91	Pa	protactinium	231.03588(2)	solid	15.37	1913
92	U	uranium	238.02891(3)	solid	19.05	1789
93	Np	neptunium	[237]	solid	20.45	1940
94	Pu	plutonium	[244]	solid	19.816	1940
95	Am	americium	[243]	solid	(unknown)	1944
96	Cm	curium	[247]	solid	13.51	1944
97	Bk	berkelium	[247]	solid	14.78	1949
98	Cf	californium	[251]	solid	15.1	1950
99	Es	einsteinium	[252]	solid	(unknown)	1952
100	Fm	fermium	[257]	(unknown)	(unknown)	1952
101	Md	mendelevium	[258]	(unknown)	(unknown)	1955
102	No	nobelium	[259]	(unknown)	(unknown)	1957
103	Lr	lawrencium	[262]	(unknown)	(unknown)	1961
104	Rf	rutherfordium	[267]	(unknown)	(unknown)	1969
105	Db	dubnium	[268]	(unknown)	(unknown)	1967
106	Sg	seaborgium	[271]	(unknown)	(unknown)	1974
107	Bh	bohrium	[272]	(unknown)	(unknown)	1976
108	Hs	hassium	[270]	(unknown)	(unknown)	1984
109	Mt	meitnerium	[276]	(unknown)	(unknown)	1982
110	Ds	darmstadtium	[281]	(unknown)	(unknown)	1994
111	Rg	roentgenium	[280]	(unknown)	(unknown)	1994
112	Cn	copernicium	[285]	(unknown)	(unknown)	1996
113	Nh	nihonium	[284]	(unknown)	(unknown)	2003
114	Fl	flerovium	[289]	(unknown)	(unknown)	1998
115	Mc	moscovium	[288]	(unknown)	(unknown)	2003
116	Lv	livermorium	[293]	(unknown)	(unknown)	2000
117	Ts	tennessine	[294]	(unknown)	(unknown)	2010
118	Og	oganesson	[294]	(unknown)	(unknown)	2002

Notes

Based on period table data by Chris Andrejewski
Converted by Daniel Griscom