Luettelo alkuaineista

Tämä on luettelo tunnetuista alkuaineista.

Taulukon rivit voi aakkostaa kunkin sarakkeen jäsenten mukaan painamalla halutun otsikon yhteydessä olevaa nappia.
| Merkki | Nimi | Järjestysluku | Atomipaino (u) | Tiheys 20 °C (g/cm3) | Sulamispiste (°C) | Höyrystymispiste (°C) | Löytövuosi | Löytäjä |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Ac | aktinium | 89 | 227 (227) | 10,07 | 1 047 | 3 197 | 1899 | Debierne |
| Ag | hopea | 47 | 107,8682(2) | 10,49 | 961,9 | 2 212 | 0 esihistoriallinen | tuntematon |
| Al | alumiini | 13 | 26,9815384(3) | 2,70 | 660,5 | 2 467 | 1825 | Ørsted |
| Am | amerikium | 95 | 243 (243) | 13,67 | 994 | 2 607 | 1944 | Seaborg |
| Ar | argon | 18 | 39,948(1) | 0,00166 | −189,4 | −185,9 | 1894 | Ramsay ja Rayleigh |
| As | arseeni | 33 | 74,921595(6) | 5,72 | 613 | 613 | 1250 n. 1250 | Albertus Magnus |
| At | astatiini | 85 | 210 (210) |  | 302 | 337 | 1940 | Corson ja MacKenzie |
| Au | kulta | 79 | 196,966570(4) | 19,32 | 1 064,4 | 2 940 | 0 esihistoriallinen | tuntematon |
| B | boori | 5 | 10,81 | 2,46 | 2 300 | 2 550 | 1808 | Davy ja Gay-Lussac |
| Ba | barium | 56 | 137,327(7) | 3,65 | 725 | 1 640 | 1808 | Davy |
| Be | beryllium | 4 | 9,0121831(5) | 1,85 | 1 278 | 2 970 | 1798 | Vauquelin |
| Bh | bohrium | 107 | 270 (270) |  |  |  | 1981 | Gesellschaft für Schwerionenforschung |
| Bi | vismutti | 83 | 208,98040(1) | 9,80 | 271,4 | 1 560 | 1540 | Georgius Agricola |
| Bk | berkelium | 97 | 247 (247) | 14,78 | 986 | 2 627 | 1949 | Seaborg, Thompson ja Ghiorso |
| Br | bromi | 35 | 79,904 | 3,14 | −7,3 | 58,8 | 1826 | Balard |
| C | hiili | 6 | 12,011 | 3,51 | 3 550 | 4 827 | 0 esihistoriallinen | tuntematon |
| Ca | kalsium | 20 | 40,078(4) | 1,54 | 839 | 1 487 | 1808 | Davy |
| Cd | kadmium | 48 | 112,414(4) | 8,64 | 321 | 765 | 1817 | Stromeyer ja Hermann |
| Ce | cerium | 58 | 140,116(1) | 6,77 | 798 | 3 257 | 1803 | Berzelius ja von Hisinger |
| Cf | kalifornium | 98 | 251 (251) | 15,1 | 900 |  | 1950 | Seaborg |
| Cl | kloori | 17 | 35,45 | 0,00295 | −101 | −34,6 | 1774 | Scheele |
| Cm | curium | 96 | 247 (247) | 13,5 | 1 340 | 3 110 | 1944 | Seaborg, James ja Ghiorso |
| Cn | kopernikium | 112 | 285 (285) |  |  |  | 1996 | Gesellschaft für Schwerionenforschung |
| Co | koboltti | 27 | 58,933194(3) | 8,89 | 1 495 | 2 870 | 1735 | Brandt |
| Cr | kromi | 24 | 51,9961(6) | 7,14 | 1 857 | 2 482 | 1797 | Vauquelin |
| Cs | cesium | 55 | 132,90545196(6) | 1,90 | 28,4 | 690 | 1860 | Kirchhoff ja Bunsen |
| Cu | kupari | 29 | 63,546(3) | 8,92 | 1 083,5 | 2 595 | 0 esihistoriallinen | tuntematon |
| Db | dubnium | 105 | 268 (268) |  |  |  | 1967/70 | Fljorov ja Ghiorso |
| Ds | darmstadtium | 110 | 281 (281) |  |  |  | 1994 | Gesellschaft für Schwerionenforschung |
| Dy | dysprosium | 66 | 162,500(1) | 8,56 | 1 409 | 2 335 | 1886 | Lecoq de Boisbaudran |
| Er | erbium | 68 | 167,259(3) | 9,05 | 1 522 | 2 510 | 1842 | Mosander |
| Es | einsteinium | 99 | 252 (252) |  | 860 |  | 1952 | Seaborg |
| Eu | europium | 63 | 151,964(1) | 5,25 | 822 | 1 597 | 1901 | Demarçay |
| F | fluori | 9 | 18,998403163(6) | 0,00158 | −219,6 | −188,1 | 1886 | Moissan |
| Fe | rauta | 26 | 55,845(2) | 7,87 | 1 535 | 2 750 | 0 esihistoriallinen | tuntematon |
| Fl | flerovium | 114 | 289 (289) |  |  |  | 1998 | Oganesjan ym. (OIJaI Dubnassa) |
| Fm | fermium | 100 | 257 (257) |  |  |  | 1952 | Seaborg |
| Fr | frankium | 87 | 223 (223) |  | 27 | 677 | 1939 | Perey |
| Ga | gallium | 31 | 69,723(1) | 5,91 | 29,8 | 2 403 | 1875 | Lecoq de Boisbaudran |
| Gd | gadolinium | 64 | 157,25(3) | 7,89 | 1 311 | 3 233 | 1880 | Galissard Galissard de Marignac |
| Ge | germanium | 32 | 72,630(8) | 5,32 | 937,4 | 2 830 | 1886 | Winkler |
| H | vety | 1 | 1,008 | 0,000084 | −259,1 | −252,9 | 1766 | Cavendish |
| He | helium | 2 | 4,002602(2) | 0,00017 | −272,2 | −268,9 | 1868 | Janssen ja Lockyer |
| Hf | hafnium | 72 | 178,49(2) | 13,31 | 2 150 | 5 400 | 1923 | Coster ja de Hevesy |
| Hg | elohopea | 80 | 200,592(3) | 13,55 | −38,9 | 356,6 | 0 esihistoriallinen | tuntematon |
| Ho | holmium | 67 | 164,930328(7) | 8,78 | 1 470 | 2 720 | 1878 | Soret, Delafontaine ja Cleve |
| Hs | hassium | 108 | 269 (269) |  |  |  | 1984 | Gesellschaft für Schwerionenforschung |
| I | jodi | 53 | 126,90447(3) | 4,94 | 113,5 | 184,4 | 1811 | Courtois |
| In | indium | 49 | 114,818(1) | 7,31 | 156,2 | 2 080 | 1863 | Reich ja Richter |
| Ir | iridium | 77 | 192,217(2) | 22,65 | 2 410 | 4 130 | 1803 | Tennant ym. |
| K | kalium | 19 | 39,0983(1) | 0,86 | 63,7 | 774 | 1807 | Davy |
| Kr | krypton | 36 | 83,798(2) | 0,00348 | −156,6 | −152,3 | 1898 | Ramsay ja Travers |
| La | lantaani | 57 | 138,90547(7) | 6,16 | 920 | 3 454 | 1839 | Mosander |
| Li | litium | 3 | 6,94 | 0,53 | 180,5 | 1 317 | 1817 | Arfwedson |
| Lr | lawrencium | 103 | 266 (266) |  |  |  | 1961 | Ghiorso |
| Lu | lutetium | 71 | 174,9668(1) | 9,84 | 1 656 | 3 315 | 1907 | Urbain |
| Lv | livermorium | 116 | 293 (293) |  |  |  | 2000 | Oganesjan ym. (OIJaI Dubnassa ja Lawrence Livermoren laboratorio) |
| Mc | moskovium | 115 | 290 (290) |  |  |  | 2003 | Oganesjan ym. (OIJaI Dubnassa ja Lawrence Livermoren laboratorio) |
| Md | mendelevium | 101 | 258 (258) |  |  |  | 1955 | Seaborg |
| Mg | magnesium | 12 | 24,305 | 1,74 | 648,8 | 1 107 | 1755 | Black |
| Mn | mangaani | 25 | 54,938043(2) | 7,44 | 1 244 | 2 097 | 1774 | Gahn |
| Mo | molybdeeni | 42 | 95,95(1) | 10,28 | 2 617 | 5 560 | 1778 | Scheele |
| Mt | meitnerium | 109 | 278 (278) |  |  |  | 1982 | Gesellschaft für Schwerionenforschung |
| N | typpi | 7 | 14,007 | 0,00117 | −209,9 | −195,8 | 1772 | Rutherford |
| Na | natrium | 11 | 22,98976928(2) | 0,97 | 97,8 | 892 | 1807 | Davy |
| Nb | niobium | 41 | 92,90637(1) | 8,58 | 2 468 | 4 927 | 1801 | Hatchett |
| Nd | neodyymi | 60 | 144,242(3) | 7,00 | 1 010 | 3 127 | 1895 | Auer von Welsbach |
| Ne | neon | 10 | 20,1797(6) | 0,00084 | −248,7 | −246,1 | 1898 | Ramsay ja Travers |
| Nh | nihonium | 113 | 286 (286) |  |  |  | 2004 | Morita ym. (RIKEN Japanissa) |
| Ni | nikkeli | 28 | 58,6934(4) | 8,91 | 1 453 | 2 732 | 1751 | Cronstedt |
| No | nobelium | 102 | 259 (259) |  |  |  | 1958 | Seaborg |
| Np | neptunium | 93 | 237 (237) | 20,48 | 640 | 3 902 | 1940 | McMillan ja Abelson |
| O | happi | 8 | 15,999 | 0,00133 | −218,4 | −182,9 | 1774 | Priestley ja Scheele |
| Og | oganesson | 118 | 294 (294) |  |  |  | 2006 | Oganesjan ym. (OIJaI Dubnassa ja Lawrence Livermoren laboratorio) |
| Os | osmium | 76 | 190,23(3) | 22,61 | 3 045 | 5 027 | 1803 | Tennant |
| P | fosfori | 15 | 30,973761998(5) | 1,82 | 44 | 280 | 1669 | Brand |
| Pa | protaktinium | 91 | 231,03588(1) | 15,37 | 1 568 | 4 000 | 1913 | Fajans ja Göhring |
| Pb | lyijy | 82 | 207,2(1) | 11,34 | 327,5 | 1 740 | 0 esihistoriallinen | tuntematon |
| Pd | palladium | 46 | 106,42(1) | 12,02 | 1 552 | 3 140 | 1803 | Wollaston |
| Pm | prometium | 61 | 145 (145) | 7,22 | 1 080 | 2 730 | 1945 | Marinsky ja Glendenin |
| Po | polonium | 84 | 209 (209) | 9,20 | 254 | 962 | 1898 | Curie, M. ja Curie, P. |
| Pr | praseodyymi | 59 | 140,90766(1) | 6,77 | 931 | 3 212 | 1895 | Auer von Welsbach |
| Pt | platina | 78 | 195,084(9) | 21,45 | 1 772 | 3 827 | 1557 | de Ulloa |
| Pu | plutonium | 94 | 244 (244) | 19,74 | 641 | 3 327 | 1940 | Seaborg |
| Ra | radium | 88 | 226 (226) | 5,50 | 700 | 1 140 | 1898 | Curie, M. ja Curie, P. |
| Rb | rubidium | 37 | 85,4678(3) | 1,53 | 39 | 688 | 1861 | Kirchhoff ja Bunsen |
| Re | renium | 75 | 186,207(1) | 21,03 | 3 180 | 5 627 | 1925 | Noddack, Tacke ja Berg |
| Rf | rutherfordium | 104 | 267 (267) |  |  |  | 1964/69 | Fljorov ja Ghiorso |
| Rg | röntgenium | 111 | 282 (282) |  |  |  | 1994 | Gesellschaft für Schwerionenforschung |
| Rh | rodium | 45 | 102,90549(2) | 12,41 | 1 966 | 3 727 | 1803 | Wollaston |
| Rn | radon | 86 | 222 (222) | 0,00923 | −71 | −61,8 | 1900 | Dorn |
| Ru | rutenium | 44 | 101,07(2) | 12,45 | 2 310 | 3 900 | 1844 | Klaus |
| S | rikki | 16 | 32,06 | 2,06 | 113 | 444,7 | 0 esihistoriallinen | tuntematon |
| Sb | antimoni | 51 | 121,760(1) | 6,69 | 630,7 | 1 750 | 0 esihistoriallinen | tuntematon |
| Sc | skandium | 21 | 44,955908(5) | 2,99 | 1 539 | 2 832 | 1879 | Nilson |
| Se | seleeni | 34 | 78,971(8) | 4,82 | 217 | 685 | 1817 | Berzelius |
| Sg | seaborgium | 106 | 269 (269) |  |  |  | 1974 | Ghiorso ym. |
| Si | pii | 14 | 28,085 | 2,33 | 1 410 | 2 355 | 1824 | Berzelius |
| Sm | samarium | 62 | 150,36(2) | 7,54 | 1 072 | 1 778 | 1879 | Lecoq de Boisbaudran |
| Sn | tina | 50 | 118,710(7) | 7,29 | 232 | 2 270 | 0 esihistoriallinen | tuntematon |
| Sr | strontium | 38 | 87,62(1) | 2,63 | 769 | 1 384 | 1790 | Crawford |
| Ta | tantaali | 73 | 180,94788(2) | 16,68 | 2 996 | 5 425 | 1802 | Ekeberg |
| Tb | terbium | 65 | 158,925354(8) | 8,25 | 1 360 | 3 041 | 1843 | Mosander |
| Tc | teknetium | 43 | 98 (98) | 11,49 | 2 172 | 5 030 | 1937 | Perrier ja Segrè |
| Te | telluuri | 52 | 127,60(3) | 6,25 | 449,6 | 990 | 1782 | Reichenstein von Reichenstein |
| Th | torium | 90 | 232,0377(4) | 11,72 | 1 750 | 4 787 | 1829 | Berzelius |
| Ti | titaani | 22 | 47,867(1) | 4,51 | 1 660 | 3 260 | 1791 | Gregor |
| Tl | tallium | 81 | 204,38 | 11,85 | 303,6 | 1 457 | 1861 | Crookes |
| Tm | tulium | 69 | 168,934218(6) | 9,32 | 1 545 | 1 727 | 1879 | Cleve |
| Ts | tennessiini | 117 | 294 (294) |  |  |  | 2010 | Oganesjan ym. (OIJaI Dubnassa ja Lawrence Livermoren laboratorio) |
| U | uraani | 92 | 238,02891(3) | 18,97 | 1 132,4 | 3 818 | 1789 | Klaproth |
| Ubn | unbinilium | 120 | 9120  |  |  |  | 9120 ei löydetty |  |
| Ubu | unbiunium | 121 | 9121  |  |  |  | 9121 ei löydetty |  |
| Uue | ununennium | 119 | 9119  |  |  |  | 9119 ei löydetty |  |
| V | vanadiini | 23 | 50,9415(1) | 6,09 | 1 890 | 3 380 | 1801 | Rio del Río |
| W | volframi | 74 | 183,84(1) | 19,26 | 3 407 | 5 927 | 1783 | Elhuyarin veljekset |
| Xe | ksenon | 54 | 131,293(6) | 0,00449 | −111,9 | −107 | 1898 | Ramsay ja Travers |
| Y | yttrium | 39 | 88,90584(1) | 4,47 | 1 523 | 3 337 | 1794 | Gadolin |
| Yb | ytterbium | 70 | 173,045(10) | 6,97 | 824 | 1 193 | 1878 | Galissard Galissard de Marignac |
| Zn | sinkki | 30 | 65,38(2) | 7,14 | 419,6 | 907 | 0 esihistoriallinen | tuntematon |
| Zr | zirkonium | 40 | 91,224(2) | 6,51 | 1 852 | 4 377 | 1789 | Klaproth |