Elements

Dᴀ	=	1
		%ᴍ₁	+	%ᴍ₂	+	%ᴍ₃	+	⋯
		Dᴍ₁		Dᴍ₂		Dᴍ₃

Z	S	G-P	u	g cm³	lb ft³	Melt (K)	Boil (K)	mg kg	Element	Origin of name
1	H	1-1	1.008	0.000	.0056	14	20	1,400	Hydrogen	Greek: hydro- and -gen (water-forming)
2	He	18-1	4.003	0.000	.0111	1	4	0.008	Helium	Mythology: Helios, Greek god and personification of the Sun
3	Li	1-2	6.939	0.534	33.34	454	1603	20	Lithium	Greek: lithos (stone)
4	Be	2-2	9.012	1.85	115.5	1560	2742	2.8	Beryllium	After beryllus (mineral beryllium aluminium cyclosilicate)
5	B	13-2	10.81	2.08	146.1	2349	4200	10	Boron	After borax (mineral sodium borate)
6	C	14-2	12.011	2.267	141.5	3915	3915	200	Carbon (graphite)	Latin: carbo (coal)
6	C	14-2	12.011	3.515	219.4	4093	5373	200	Carbon (diamond)	Latin: carbo (coal)
7	N	15-2	14.007	0.001	.0781	63	77	19	Nitrogen	Greek: nitron and -gen (niter-forming)
8	O	16-2	15.999	0.001	.0892	54	90	461,000	Oxygen	Greek: oxy- and -gen (acid-forming)
9	F	17-2	18.998	0.002	.1059	53	85	585	Fluorine	Latin: fluere (to flow)
10	Ne	18-2	20.18	0.001	.0562	25	27	0.005	Neon	Greek: neos (new)
—	H₂O	—	18.015	1	62.43	273	373	∼50×10⁶	Water	—
11	Na	1-3	22.99	0.968	60.62	371	1156	23,600	Sodium	Latin: natrium (soda)
12	Mg	2-3	24.305	1.738	108.5	923	1363	23,300	Magnesium	After magnesia or magnesia alba (mineral magnesium oxide)
13	Al	13-3	26.982	2.698	168.4	933	2743	82,300	Aluminium	After alumina (mineral aluminium oxide)
14	Si	14-3	28.085	2.329	145.4	1687	3538	282,000	Silicon	After silica (mineral silicon dioxide)
15	P	15-3	30.974	1.823	113.6	317	553	1,050	Phosphorus (white)	Mythology: Phosphorus (morning star), Greek god of dawn (morning appearance of Venus)
16	S	16-3	32.06	2.067	129.0	388	718	350	Sulfur (alpha)	Latin: sulphur (fire and brimstone)
17	Cl	17-3	35.45	0.003	.2006	172	239	145	Chlorine	Greek: chloros (greenish yellow)
18	Ar	18-3	39.948	0.002	.1114	84	87	3.5	Argon	Greek: argos (idle)
19	K	1-4	39.098	0.862	53.81	337	1032	20,900	Potassium	Latin: kalium" (alkali in potash) and potassium (from potash)
20	Ca	2-4	40.078	1.55	96.14	1115	1757	41,500	Calcium	Latin: calx (lime)
21	Sc	3-4	44.956	2.985	186.6	1814	3109	22	Scandium	For Scandia (Scandinavia in Latin) where first identified
22	Ti	4-4	47.867	4.506	283.4	1941	3560	5,650	Titanium	Mythology: Titans, the sons of Gaia, the Earth goddess
23	V	5-4	50.942	6.0	381.4	2183	3680	120	Vanadium	Mythology: Freyja (Lady) Vanadis, the Vanir (Norse group of gods) dis (goddess of fate)
24	Cr	6-4	51.996	7.19	446.4	2180	2944	102	Chromium	Greek: chroma (colour)
25	Mn	7-4	54.938	7.21	464.5	1519	2334	950	Manganese	After magnes or magnesia negra (mineral pyrolusite)
26	Fe	8-4	55.845	7.875	491.6	1811	3134	56,300	Iron (α-)	Latin: ferrum
27	Co	9-4	58.933	8.90	553.1	1768	3200	25	Cobalt	After cobold (a mischievous sprite from German miner folklore)
28	Ni	10-4	58.693	8.912	556.4	1728	3003	84	Nickel	After nickel (a mischievous sprite from German miner folklore)
29	Cu	11-4	63.546	8.933	559.4	1358	2835	60	Copper	Latin: cuprum
30	Zn	12-4	65.382	7.134	445.4	693	1180	70	Zinc	German: zinke (prong, tooth)
31	Ga	13-4	69.723	5.907	368.8	303	2673	19	Gallium	For Gallia (France in Latin) where first identified
32	Ge	14-4	72.631	5.323	332.3	1211	3106	1.5	Germanium	For Germania (Germany in Latin) where first identified
33	As	15-4	74.922	5.727	360.6	887	887	1.8	Arsenic	Latin: arsenicum
34	Se	16-4	78.972	4.809	300.2	494	958	0.05	Selenium (gray)	Mythology: Selene, Greek goddess of the moon
35	Br	17-4	79.904	3.103	194.9	266	332	2.4	Bromine	Greek: bromos (stench)
36	Kr	18-4	83.798	0.004	.2330	116	120	1×10⁻⁴	Krypton	Greek: kryptos (hidden)
37	Rb	1-5	85.468	1.532	95.64	312	961	90	Rubidium	Latin: rubidus (deep red)
38	Sr	2-5	87.621	2.64	164.8	1050	1650	370	Strontium	For Strontian, Scotland where first identified
39	Y	3-5	88.906	4.472	279.0	1799	3203	33	Yttrium	For Ytterby, Sweden where first identified
40	Zr	4-5	91.224	6.52	406.2	2128	4650	165	Zirconium	After zircon (mineral jargoon, hyacinth, jacinth, ligure, etc.)
41	Nb	5-5	92.906	8.57	535.0	2750	5017	20	Niobium	Mythology: Niobe, daughter of King Tantalus of Tantalis (see Tantalum)
42	Mo	6-5	95.951	10.28	638.0	2896	4912	1.2	Molybdenum	Greek: molybdos (lead)
43	Tc	7-5	98	11	717.9	2430	4538	∼ 3×10⁻⁹	Technetium	Greek: tekhnètos (artificial)
44	Ru	8-5	101.072	12.45	772.2	2607	4423	0.001	Ruthenium	For Ruthenia (Russia in Latin) where first identified
45	Rh	9-5	102.906	12.41	774.7	2237	3968	0.001	Rhodium	Greek: rhodos, (rose-coloured)
46	Pd	10-5	106.421	12.023	750.4	1828	3236	0.015	Palladium	Mythology: Pallas Athena, Greek goddess of wisdom, craft, and warfare
47	Ag	11-5	107.868	10.501	655.6	1235	2435	0.075	Silver	Latin: argentum
48	Cd	12-5	112.414	8.65	542.5	594	1040	0.159	Cadmium	Mythology: Cadmus, first King of Thebes (Greek city-state)
49	In	13-5	114.818	7.31	456.3	430	2345	0.25	Indium	Latin: indicum (of India), for the source of indigo dye
50	Sn	14-5	118.711	7.287	454.9	505	2875	2.3	Tin (white, β-)	Latin: stannum
51	Sb	15-5	121.760	6.697	417.3	904	1908	0.2	Antimony	Greek: anti- (against) and monos (alone)
52	Te	16-5	127.603	6.24	389.1	723	1261	0.001	Tellurium	Latin: tellus (earth)
53	I	17-5	126.904	4.933	307.8	387	457	0.45	Iodine	Greek: iodes (violet-coloured)
54	Xe	18-5	131.294	0.006	.3675	161	165	3×10⁻⁵	Xenon	Greek: xenos (strange)
55	Cs	1-6	132.905	∼1.88	116.9	302	944	3	Caesium	Latin: caesius (sky blue)
56	Ba	2-6	137.328	3.51	224.4	1000	2118	425	Barium	Greek: barys (heavy)
57	La	3-6	138.905	6.162	383.6	1193	3737	39	Lanthanum	Greek: lanthanein (to lie hidden)
58	Ce	3-6	140.116	6.770	422.6	1068	3716	66.5	Cerium	Mythology: Ceres, Roman goddess of agriculture
59	Pr	3-6	140.908	6.773	422.8	1208	3403	9.2	Praseodymium	Greek: praseios didymos (green twin)
60	Nd	3-6	144.242	7.007	437.4	1297	3347	41.5	Neodymium	Greek: neos didymos (new twin)
61	Pm	3-6	145	7.26	453.2	1315	3273	2×10⁻¹⁹	Promethium	Mythology: Prometheus, who stole fire from the Gods for humanity
62	Sm	3-6	150.362	7.52	469.5	1345	2173	7.05	Samarium	After samarskite (mineral named for Vassili Samarsky-Bykhovets)
63	Eu	3-6	151.964	5.264	327.3	1099	1802	2	Europium	For Europe, the continent where first identified
64	Gd	3-6	157.253	7.895	492.9	1585	3273	6.2	Gadolinium	Person: Johan Gadolin, chemist, physicist and mineralogist
65	Tb	3-6	158.925	8.229	513.7	1629	3396	1.2	Terbium	For Ytterby, Sweden where first identified
66	Dy	3-6	162.500	8.540	533.8	1680	2840	5.2	Dysprosium	Greek: dysprositos (hard to get)
67	Ho	3-6	164.930	8.795	549.1	1734	2873	1.3	Holmium	For Holmia (Stockholm in Latin) where first identified
68	Er	3-6	167.259	9.066	566.0	1802	3141	3.5	Erbium	For Ytterby, Sweden where first identified
69	Tm	3-6	168.934	9.321	581.9	1818	2223	0.52	Thulium	For Thule (Scandinavia in Ancient Greek) where first identified
70	Yb	3-6	173.045	6.90	434.8	1097	1469	3.2	Ytterbium	For Ytterby, Sweden where first identified
71	Lu	3-6	174.967	9.841	614.3	1925	3675	0.8	Lutetium	For Lutetia (Paris in Latin) where first identified
72	Hf	4-6	178.492	13.31	830.9	2506	4876	3	Hafnium	For Hafnia (Copenhagen in Latin) where first identified
73	Ta	5-6	180.948	16.69	1,040	3290	5731	2	Tantalum	Mythology: Tantalus, first King of Tantalis (Greek city-state in present-day Turky)
74	W	6-6	183.841	19.25	1,202	3695	6203	1.3	Tungsten	Swedish tung sten (heavy stone), W is wolfram, the old name of the tungsten mineral wolframite)
75	Re	7-6	186.207	21.02	1,312	3459	5903	7×10⁻⁴	Rhenium	For Rhenus (Rhine river in Latin) where first identified
76	Os	8-6	190.233	22.59	1,411	3306	5285	0.002	Osmium	Greek: osmè (smell)
77	Ir	9-6	192.217	22.56	1,408	2719	4403	0.001	Iridium	Mythology: Iris, Greek goddess of the rainbow
78	Pt	10-6	195.085	21.460	1,340	2041	4098	0.005	Platinum	Spanish platina (little silver)
79	Au	11-6	196.967	19.282	1,204	1337	3243	0.004	Gold	Latin: aurum
80	Hg	12-6	200.592	13.5336	844.9	234	630	0.085	Mercury	Mythology: Mercury, Roman god of mobility • Hg from hydr- (water) and argyros (silver)
81	Tl	13-6	204.38	11.85	739.8	577	1746	0.85	Thallium	Greek: thallos (green twig)
82	Pb	14-6	207.21	11.342	708.1	601	2022	14	Lead	Latin: plumbum
83	Bi	15-6	208.980	9.78	612.2	545	1837	0.009	Bismuth	Uncertain: possibly Arabic or German
84	Po	16-6	209	∼9.297	581.8	527	1235	2×10⁻¹⁰	Polonium	For Polonia (Poland), homeland of Marie Curie, who also discovered Radium
85	At	17-6	210	∼6.35	437.0	575	610	3×10⁻²⁰	Astatine	Greek: astatos (unstable)
86	Rn	18-6	222	0.010	.6074	202	211	4×10⁻¹³	Radon	Latin: exradio (from radium), first identified as radioactive decay of radium
87	Fr	1-7	223	∼2.9	116.7	300	950	∼ 1×10⁻¹⁸	Francium	For Francia (France in Latin) where first identified
88	Ra	2-7	226	5.5	343.4	973	2010	9×10⁻⁷	Radium	Latin: radius (ray)
89	Ac	3-7	227	10.07	628.6	1500	3500	5.5×10⁻¹⁰	Actinium	Greek: aktis (ray)
90	Th	3-7	232.038	11.72	731.7	2023	5061	9.6	Thorium	Mythology: Thor, Scandinavian god of thunder, lightning and strength
91	Pa	3-7	231.036	15.37	959.5	1841	4300	1.4×10⁻⁶	Protactinium	Greek: protos (first, before) and actinium (product of radioactive decay of protactinium)
92	U	3-7	238.029	19.1	1,183	1405	4404	2.7	Uranium	Mythology: Uranus, Greek god of the sky and heavens
93	Np	3-7	237	∼19.915	1,277	917	4273	≤ 3×10⁻¹²	Neptunium	Mythology: Neptune, Roman god of freshwater and the sea
94	Pu	3-7	244	19.816	1,237	913	3505	≤ 3×10⁻¹¹	Plutonium	Mythology: Pluto, Greco-Roman god of Hades (the underworld)
95	Am	3-7	243	12	854.6	1449	2880	—	Americium	For Americas, the continent where first synthesized
96	Cm	3-7	247	13.51	843.4	1613	3383	—	Curium	Person: Marie & Pierre Curie, physicist and chemist
97	Bk	3-7	247	∼14.02	923.3	1259	2900	—	Berkelium	For Berkeley, California where first synthesized
98	Cf	3-7	251	15.1	942.7	1173	1743	—	Californium	For California where first synthesized
99	Es	3-7	252	8.84	551.9	1133	1269	—	Einsteinium	Person: Albert Einstein, physicist
100	Fm	3-7	257	∼9.71	610	1800	–	—	Fermium	Person: Enrico Fermi, physicist
101	Md	3-7	258	∼10.37	643	1100	–	—	Mendelevium	Person: Dmitri Mendeleev, chemist and inventor
102	No	3-7	259	∼9.94	620	1100	–	—	Nobelium	Person: Alfred Nobel, chemist, engineer, inventor of dynamite
103	Lr	3-7	266	∼16.1	1005	1900	–	—	Lawrencium	Person: Ernest O. Lawrence, physicist
104	Rf	4-7	267	∼23.2	1,450	2400	5800	—	Rutherfordium	Person: Ernest Rutherford, chemist and physicist
105	Db	5-7	268	∼29.3	1,830	–	–	—	Dubnium	For Dubna, Russia (home of JINR) where first synthesized
106	Sg	6-7	269	∼35.0	2,180	–	–	—	Seaborgium	Person: Glenn T. Seaborg, scientist
107	Bh	7-7	270	∼37.1	2,320	–	–	—	Bohrium	Person: Niels Bohr, physicist
108	Hs	8-7	277	∼40.7	2,540	–	–	—	Hassium	For Hesse, Germany where first synthesized
109	Mt	9-7	278	∼37.4	2,330	–	–	—	Meitnerium	Person: Lise Meitner, physicist
110	Ds	10-7	281	∼34.8	2,170	–	–	—	Darmstadtium	For Darmstadt, Germany where first synthesized
111	Rg	11-7	282	∼28.7	1,790	–	–	—	Roentgenium	Person: Wilhelm Conrad Röntgen, physicist
112	Cn	12-7	285	∼23.7	1,480	–	∼357	—	Copernicium	Person: Nicolaus Copernicus, astronomer
113	Nh	13-7	286	∼16	999	700	1430	—	Nihonium	For Nihon (Japan) where first synthesized
114	Fl	14-7	289	∼14	874	–	∼210	—	Flerovium	For Flerov LNR (named for Georgy Flyorov), where first synthesized
115	Mc	15-7	290	∼13.5	843	670	∼1400	—	Moscovium	For Moscow Oblast, Russia where first synthesized
116	Lv	16-7	293	∼12.9	805	∼709	∼1085	—	Livermorium	For Lawrence Livermore NL where first synthesized (with JINR)
117	Ts	17-7	294	∼7.2	450	∼723	883	—	Tennessine	For Tennessee, United States where first synthesized
118	Og	18-7	294	∼5.0	310	–	∼350	—	Oganesson	Person: Yuri Oganessian, physicist
126	Kt	3-8	316	—	—	—	—	—	Kryptonium	For Krypton (exoplanet) where first synthesized

“Kryptonite is the common ore of the super-actinide kryptonium, an unusually stable trans-uranic element, whose atomic number is believed to be 126. Kryptonium’s half-life is thought to be approximately 250,000 years. Created from the fused elements of the planet Krypton, kryptonite is a substance that is unique in the known universe. No one has been able to duplicate the thermonuclear reaction that created kryptonite. Indeed, all attempts at synthesizing it have been unsuccessful.³⁵”

³⁵ Action Comics #599 • Used to create Metallo.³⁶ Man of Steel #1, Superman #1 • Acquired by Lex Luthor.³⁷ Superman #238 • Divided into small pieces.³⁸ Action Comics #654 • Acquired by Batman and Bloodsport.³⁹ Superman #4 • Acquired by Superman.⁴⁰ Superman #41 • Slowly toxic to humans.⁴¹ Superman #19 • Red k. is a magic fake.⁴² Superman #49–50, Action Comics #659, The Adventures of Superman #463, 472, Starman #28

Stern, Roger (1992) Superman: the Man of Steel Sourcebook, pp. 24–25,28. Mayfair Games Inc.. ISBN 0-923763-38-4.