List Of Unknown Elements

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Elements are the basic identifiable forms of matter.

Have you ever wondered if there are any undiscovered elements or how scientists find new elements? Although there are elements we have not yet created or found in nature, scientists already know what they will be and can predict their properties.

For example, element 125 has not been observed, but when it is, it will appear in a new row of the periodic table as a transition metal. Its location and properties can be predicted because the periodic table organizes elements according to increasing atomic number. Thus, there are no true holes in the periodic table. Contrast this with Mendeleev's original periodic table, which organized elements according to increasing atomic weight. At that time, the structure of the atom was not as well-understood.

The Cold War arms race, Ancient Egyptian make-up and medieval laxatives. What do all these things have in common?

There were true holes in the table since elements weren't defined as clearly as they are now.
ElementOrigin of name[2][3]GroupPeriodBlockStandard
atomic
weightAr°(E)[a]
Density[b][c]Melting point[d]Boiling point[e]Specific
heat
capacity[f]
Electro­negativity[g]Abundance
in Earth's
crust[h]
Origin[i]Phase at r.t.[j]
Atomic number
Z
SymbolName(Da)(g/cm3)(K)(K)(J/g · K)(mg/kg)
1HHydrogenGreek elements hydro- and -gen, 'water-forming'11s-block1.00800.0000898814.0120.2814.3042.201400primordialgas
2HeHeliumGreek hḗlios, 'sun'181s-block4.00260.0001785[k]4.225.1930.008primordialgas
3LiLithiumGreek líthos, 'stone'12s-block6.940.534453.6915603.5820.9820primordialsolid
4BeBerylliumBeryl, a mineral (ultimately from the name of Belur in southern India)[4]22s-block9.01221.85156027421.8251.572.8primordialsolid
5BBoronBorax, a mineral (from Arabicbawraq, Middle Persian *bōrag)132p-block10.812.34234942001.0262.0410primordialsolid
6CCarbonLatincarbo, 'coal'142p-block12.0112.267>400043000.7092.55200primordialsolid
7NNitrogenGreek nítron and -gen, 'niter-forming'152p-block14.0070.001250663.1577.361.043.0419primordialgas
8OOxygenGreek oxy- and -gen, 'acid-forming'162p-block15.9990.00142954.3690.200.9183.44461000primordialgas
9FFluorineLatin fluere, 'to flow'172p-block18.9980.00169653.5385.030.8243.98585primordialgas
10NeNeonGreek néon, 'new'182p-block20.1800.000900224.5627.071.030.005primordialgas
11NaSodiumEnglish (from medieval Latin) soda
· Symbol Na is derived from New Latinnatrium, coined from German Natron, 'natron'
13s-block22.9900.968370.8711561.2280.9323600primordialsolid
12MgMagnesiumMagnesia, a district of Eastern Thessaly in Greece23s-block24.3051.73892313631.0231.3123300primordialsolid
13AlAluminiumAlumina, from Latin alumen (gen. aluminis), 'bitter salt, alum'133p-block26.9822.70933.4727920.8971.6182300primordialsolid
14SiSiliconLatin silex, 'flint' (originally silicium)143p-block28.0852.3290168735380.7051.9282000primordialsolid
15PPhosphorusGreek phōsphóros, 'light-bearing'153p-block30.9741.823317.305500.7692.191050primordialsolid
16SSulfurLatin sulphur, 'brimstone'163p-block32.062.07388.36717.870.712.58350primordialsolid
17ClChlorineGreek chlōrós, 'greenish yellow'173p-block35.450.0032171.6239.110.4793.16145primordialgas
18ArArgonGreek argós, 'idle' (because of its inertness)183p-block39.950.00178483.8087.300.523.5primordialgas
19KPotassiumNew Latinpotassa, 'potash', itself from pot and ash
· Symbol K is derived from Latin kalium
14s-block39.0980.89336.5310320.7570.8220900primordialsolid
20CaCalciumLatin calx, 'lime'24s-block40.0781.55111517570.6471.0041500primordialsolid
21ScScandiumLatin Scandia, 'Scandinavia'34d-block44.9562.985181431090.5681.3622primordialsolid
22TiTitaniumTitans, the sons of the Earth goddess of Greek mythology44d-block47.8674.506194135600.5231.545650primordialsolid
23VVanadiumVanadis, an Old Norse name for the Scandinavian goddess Freyja54d-block50.9426.11218336800.4891.63120primordialsolid
24CrChromiumGreek chróma, 'colour'64d-block51.9967.15218029440.4491.66102primordialsolid
25MnManganeseCorrupted from ; see § magnesium74d-block54.9387.21151923340.4791.55950primordialsolid
26FeIronEnglish word, from Proto-Celtic *īsarnom ('iron'), from a root meaning 'blood'
· Symbol Fe is derived from Latin ferrum
84d-block55.8457.874181131340.4491.8356300primordialsolid
27CoCobaltGermanKobold, 'goblin'94d-block58.9338.90176832000.4211.8825primordialsolid
28NiNickelNickel, a mischievous sprite of German miner mythology104d-block58.6938.908172831860.4441.9184primordialsolid
29CuCopperEnglish word, from Latin cuprum, from Ancient Greek Kýpros 'Cyprus'114d-block63.5468.961357.7728350.3851.9060primordialsolid
30ZnZincMost likely from German Zinke, 'prong' or 'tooth', though some suggest Persiansang, 'stone'124d-block65.387.14692.8811800.3881.6570primordialsolid
31GaGalliumLatin Gallia, 'France'134p-block69.7235.91302.914626730.3711.8119primordialsolid
32GeGermaniumLatin Germania, 'Germany'144p-block72.6305.3231211.4031060.322.011.5primordialsolid
33AsArsenicFrencharsenic, from Greek arsenikón 'yellow arsenic' (influenced by arsenikós, 'masculine' or 'virile'), from a West Asianwanderword ultimately from Old Iranian*zarniya-ka, 'golden'154p-block74.9225.7271090[l]8870.3292.181.8primordialsolid
34SeSeleniumGreek selḗnē, 'moon'164p-block78.9714.814539580.3212.550.05primordialsolid
35BrBromineGreek brômos, 'stench'174p-block79.9043.1028265.8332.00.4742.962.4primordialliquid
36KrKryptonGreek kryptós, 'hidden'184p-block83.7980.003749115.79119.930.2483.001×10−4primordialgas
37RbRubidiumLatin rubidus, 'deep red'15s-block85.4681.532312.469610.3630.8290primordialsolid
38SrStrontiumStrontian, a village in Scotland, where it was found25s-block87.622.64105016550.3010.95370primordialsolid
39YYttriumYtterby, Sweden, where it was found; see also terbium, erbium, ytterbium35d-block88.9064.472179936090.2981.2233primordialsolid
40ZrZirconiumZircon, a mineral, from Persian zargun, 'gold-hued'45d-block91.2246.52212846820.2781.33165primordialsolid
41NbNiobiumNiobe, daughter of king Tantalus from Greek mythology; see also tantalum55d-block92.9068.57275050170.2651.620primordialsolid
42MoMolybdenumGreek molýbdaina, 'piece of lead', from mólybdos, 'lead', due to confusion with lead ore galena (PbS)65d-block95.9510.28289649120.2512.161.2primordialsolid
43TcTechnetiumGreek tekhnētós, 'artificial'75d-block[97][a]11243045381.9~ 3×10−9from decaysolid
44RuRutheniumNew Latin Ruthenia, 'Russia'85d-block101.0712.45260744230.2382.20.001primordialsolid
45RhRhodiumGreek rhodóeis, 'rose-coloured', from rhódon, 'rose'95d-block102.9112.41223739680.2432.280.001primordialsolid
46PdPalladiumPallas, an asteroid, considered a planet at the time105d-block106.4212.0231828.0532360.2442.200.015primordialsolid
47AgSilverEnglish word
· Symbol Ag is derived from Latin argentum
115d-block107.8710.491234.9324350.2351.930.075primordialsolid
48CdCadmiumNew Latin cadmia, from King Kadmos125d-block112.418.65594.2210400.2321.690.159primordialsolid
49InIndiumLatin indicum, 'indigo', the blue colour found in its spectrum135p-block114.827.31429.7523450.2331.780.25primordialsolid
50SnTinEnglish word
· Symbol Sn is derived from Latin stannum
145p-block118.717.265505.0828750.2281.962.3primordialsolid
51SbAntimonyLatin antimonium, the origin of which is uncertain: folk etymologies suggest it is derived from Greek antí ('against') + mónos ('alone'), or Old Frenchanti-moine, 'Monk's bane', but it could plausibly be from or related to Arabic ʾiṯmid, 'antimony', reformatted as a Latin word
· Symbol Sb is derived from Latin stibium 'stibnite'
155p-block121.766.697903.7818600.2072.050.2primordialsolid
52TeTelluriumLatin tellus, 'the ground, earth'165p-block127.606.24722.6612610.2022.10.001primordialsolid
53IIodineFrench iode, from Greek ioeidḗs, 'violet'175p-block126.904.933386.85457.40.2142.660.45primordialsolid
54XeXenonGreek xénon, neuter form of xénos 'strange'185p-block131.290.005894161.4165.030.1582.603×10−5primordialgas
55CsCaesiumLatin caesius, 'sky-blue'16s-block132.911.93301.599440.2420.793primordialsolid
56BaBariumGreek barýs, 'heavy'26s-block137.333.51100021700.2040.89425primordialsolid
57LaLanthanumGreek lanthánein, 'to lie hidden'n/a6f-block138.916.162119337370.1951.139primordialsolid
58CeCeriumCeres, a dwarf planet, considered a planet at the timen/a6f-block140.126.770106837160.1921.1266.5primordialsolid
59PrPraseodymiumGreek , 'green twin'n/a6f-block140.916.77120837930.1931.139.2primordialsolid
60NdNeodymiumGreek , 'new twin'n/a6f-block144.247.01129733470.191.1441.5primordialsolid
61PmPromethiumPrometheus, a figure in Greek mythologyn/a6f-block[145]7.26131532731.132×10−19from decaysolid
62SmSamariumSamarskite, a mineral named after V. Samarsky-Bykhovets, Russian mine officialn/a6f-block150.367.52134520670.1971.177.05primordialsolid
63EuEuropiumEuropen/a6f-block151.965.244109918020.1821.22primordialsolid
64GdGadoliniumGadolinite, a mineral named after Johan Gadolin, Finnish chemist, physicist and mineralogistn/a6f-block157.257.90158535460.2361.26.2primordialsolid
65TbTerbiumYtterby, Sweden, where it was found; see also yttrium, erbium, ytterbiumn/a6f-block158.938.23162935030.1821.21.2primordialsolid
66DyDysprosiumGreek dysprósitos, 'hard to get'n/a6f-block162.508.540168028400.171.225.2primordialsolid
67HoHolmiumNew Latin Holmia, 'Stockholm'n/a6f-block164.938.79173429930.1651.231.3primordialsolid
68ErErbiumYtterby, Sweden, where it was found; see also yttrium, terbium, ytterbiumn/a6f-block167.269.066180231410.1681.243.5primordialsolid
69TmThuliumThule, the ancient name for an unclear northern locationn/a6f-block168.939.32181822230.161.250.52primordialsolid
70YbYtterbiumYtterby, Sweden, where it was found; see also yttrium, terbium, erbiumn/a6f-block173.056.90109714690.1551.13.2primordialsolid
71LuLutetiumLatin Lutetia, 'Paris'36d-block174.979.841192536750.1541.270.8primordialsolid
72HfHafniumNew Latin Hafnia, 'Copenhagen' (from Danishhavn, harbour)46d-block178.4913.31250648760.1441.33primordialsolid
73TaTantalumKing Tantalus, father of Niobe from Greek mythology; see also niobium56d-block180.9516.69329057310.141.52primordialsolid
74WTungstenSwedish , 'heavy stone'
· Symbol W is from Wolfram, originally from Middle High Germanwolf-rahm 'wolf's foam' describing the mineral wolframite[5]
66d-block183.8419.25369558280.1322.361.3primordialsolid
75ReRheniumLatin Rhenus, 'the Rhine'76d-block186.2121.02345958690.1371.97×10−4primordialsolid
76OsOsmiumGreek osmḗ, 'smell'86d-block190.2322.59330652850.132.20.002primordialsolid
77IrIridiumIris, the Greek goddess of the rainbow96d-block192.2222.56271947010.1312.200.001primordialsolid
78PtPlatinumSpanishplatina, 'little silver', from plata 'silver'106d-block195.0821.452041.440980.1332.280.005primordialsolid
79AuGoldEnglish word, from the same root as 'yellow'
· Symbol Au is derived from Latin aurum
116d-block196.9719.31337.3331290.1292.540.004primordialsolid
80HgMercuryMercury, Roman god of commerce, communication, and luck, known for his speed and mobility
· Symbol Hg is derived from its Latin name hydrargyrum, from Greek hydrárgyros, 'water-silver'
126d-block200.5913.534234.43629.880.142.000.085primordialliquid
81TlThalliumGreek thallós, 'green shoot or twig'136p-block204.3811.8557717460.1291.620.85primordialsolid
82PbLeadEnglish word, from Proto-Celtic *ɸloudom, from a root meaning 'flow'
· Symbol Pb is derived from Latin plumbum
146p-block207.211.34600.6120220.1291.87 (2+)
2.33 (4+)
14primordialsolid
83BiBismuthGerman Wismut, from weißMasse 'white mass', unless from Arabic156p-block208.989.78544.718370.1222.020.009primordialsolid
84PoPoloniumLatin Polonia, 'Poland', home country of Marie Curie166p-block[209][a]9.19652712352.02×10−10from decaysolid
85AtAstatineGreek ástatos, 'unstable'176p-block[210](7)5756102.23×10−20from decayunknown phase
86RnRadonRadium emanation, originally the name of the isotopeRadon-222186p-block[222]0.00973202211.30.0942.24×10−13from decaygas
87FrFranciumFrance, home country of discoverer Marguerite Perey17s-block[223](2.48)281890>0.79[6]~ 1×10−18from decayunknown phase
88RaRadiumFrench radium, from Latin radius, 'ray'27s-block[226]5.597320100.0940.99×10−7from decaysolid
89AcActiniumGreek aktís, 'ray'n/a7f-block[227]10132334710.121.15.5×10−10from decaysolid
90ThThoriumThor, the Scandinavian god of thundern/a7f-block232.0411.7211550610.1131.39.6primordialsolid
91PaProtactiniumProto- (from Greek prôtos, 'first, before') + actinium, since actinium is produced through the radioactive decay of protactiniumn/a7f-block231.0415.37184143001.51.4×10−6from decaysolid
92UUraniumUranus, the seventh planet in the Solar Systemn/a7f-block238.0319.11405.344040.1161.382.7primordialsolid
93NpNeptuniumNeptune, the eighth planet in the Solar Systemn/a7f-block[237]20.4591742731.36≤ 3×10−12from decaysolid
94PuPlutoniumPluto, a dwarf planet, considered a planet in the Solar System at the timen/a7f-block[244]19.85912.535011.28≤ 3×10−11from decaysolid
95AmAmericiumThe Americas, where the element was first synthesised, by analogy with its homologue§ europiumn/a7f-block[243]12144928801.13syntheticsolid
96CmCuriumPierre Curie and Marie Curie, French physicists and chemistsn/a7f-block[247]13.51161333831.28syntheticsolid
97BkBerkeliumBerkeley, California, where the element was first synthesisedn/a7f-block[247]14.78125929001.3syntheticsolid
98CfCaliforniumCalifornia, where the element was first synthesised in the LBNL laboratoryn/a7f-block[251]15.11173(1743)[b]1.3syntheticsolid
99EsEinsteiniumAlbert Einstein, German physicistn/a7f-block[252]8.841133(1269)1.3syntheticsolid
100FmFermiumEnrico Fermi, Italian physicistn/a7f-block[257](9.7)[b](1125)[7]
(1800)[8]
1.3syntheticunknown phase
101MdMendeleviumDmitri Mendeleev, Russian chemist who proposed the periodic tablen/a7f-block[258](10.3)(1100)1.3syntheticunknown phase
102NoNobeliumAlfred Nobel, Swedish chemist and engineern/a7f-block[259](9.9)(1100)1.3syntheticunknown phase
103LrLawrenciumErnest Lawrence, American physicist37d-block[266](14.4)(1900)1.3syntheticunknown phase
104RfRutherfordiumErnest Rutherford, chemist and physicist from New Zealand47d-block[267](17)(2400)(5800)syntheticunknown phase
105DbDubniumDubna, Russia, where the element was discovered in the JINR laboratory57d-block[268](21.6)syntheticunknown phase
106SgSeaborgiumGlenn T. Seaborg, American chemist67d-block[269](23–24)syntheticunknown phase
107BhBohriumNiels Bohr, Danish physicist77d-block[270](26–27)syntheticunknown phase
108HsHassiumNew Latin Hassia, 'Hesse', a state in Germany87d-block[269](27–29)syntheticunknown phase
109MtMeitneriumLise Meitner, Austrian physicist97d-block[278](27–28)syntheticunknown phase
110DsDarmstadtiumDarmstadt, Germany, where the element was first synthesised in the GSI laboratories107d-block[281](26–27)syntheticunknown phase
111RgRoentgeniumWilhelm Conrad Röntgen, German physicist117d-block[282](22–24)syntheticunknown phase
112CnCoperniciumNicolaus Copernicus, Polish astronomer127d-block[285](14.0)(283)(340)[b]syntheticunknown phase
113NhNihoniumJapaneseNihon, 'Japan', where the element was first synthesised in the Riken laboratories137p-block[286](16)(700)(1400)syntheticunknown phase
114FlFleroviumFlerov Laboratory of Nuclear Reactions, part of JINR, where the element was synthesised; itself named after Georgy Flyorov, Russian physicist147p-block[289](9.928)(200)[b](380)syntheticunknown phase
115McMoscoviumMoscow, Russia, where the element was first synthesised in the JINR laboratories157p-block[290](13.5)(700)(1400)syntheticunknown phase
116LvLivermoriumLawrence Livermore National Laboratory in Livermore, California167p-block[293](12.9)(700)(1100)syntheticunknown phase
117TsTennessineTennessee, United States, where Oak Ridge National Laboratory is located177p-block[294](7.1–7.3)(700)(883)syntheticunknown phase
118OgOganessonYuri Oganessian, Russian physicist187p-block[294](6.6–7.4)(325)(450)syntheticunknown phase
  1. ^ abcStandard atomic weight
    • When elements of higher atomic number (more protons) are observed, it's often not the element itself that is seen, but rather a decay product.
    • Superheavy elements tend to be highly unstable.
  2. In that respect, even new elements aren't always directly discovered. In some cases, insufficient amounts of the elements have been synthesized for us to know what the element looks like.
  3. Yet, the elements are considered to be known, are named, and are listed on the periodic table.
  4. There will be new elements added to the periodic table, but where they will be placed on the table is already known.
  5. For example, there won't be any new elements between hydrogen and helium or seaborgium and bohrium.
  6. Chemical elements that have been mistakenly "discovered".
  7. Further investigation showed that their discovery was either mistaken, that they have been mistaken from an already-known element, or mixture of two elements, or that they indicated a failing in theory where a new element had been assumed rather than some previously unknown behaviour.[i].
  8. the spectrum of highly-ionised iron being identified as Coronium.
  9. ^Ryden, Barbara; Pogge, Richard. "Interstellar and Intergalactic Medium".
  10. ^ abElement name etymologies. ^ abFermi, Enrico (December 12, 1938).
  11. "Artificial radioactivity produced by neutron bombardment"(PDF). ^Linnemann, Eduard (1886). "Austrium, ein neues metallisches Element".
  12. Monatshefte für Chemie. doi:10.1007/BF01516564.

Metallic Nonmetals

Browse other questions tagged androidlistapikotlintry-catch or ask your own question.

  1. ^Baskerville, Charles (1901). "On the Existence of a new Element associated with Thorium". Soc.23 (10): 761–764. ^Kern, Serge (1877).
  2. "On a new metal, davyum". 4 (23): 158–159. ^Delafontaine, Marc (1878).
  3. "Sur le décepium, métal nouveau de la samarskite". Journal de pharmacie et de chimie.
  4. "Discovery of a new element 'nipponiumʼ: re-evaluation of pioneering works of Masataka Ogawa and his son Eijiro Ogawa".
  5. Spectrochimica Acta Part B: Atomic Spectroscopy. 59 (8): 1305–1310. Bibcode:2004AcSpe.59.1305Y. ^Rose, Heinrich (1846). "On a new metal, pelopium, contained in the Bavarian tantalite".
  6. 29 (195): 409–416. ^Fontani, Marco (2005-09-10). "The Twilight of the Naturally-Occurring Elements: Moldavium (Ml), Sequanium (Sq) and Dor (Do)".
  7. International Conference on the History of Chemistry. Archived from the original on 2006-02-24. ^Delafontaine, M. "Ueber das Wasium". Annalen der Chemie und Pharmacie. 131 (3): 368–372. Retrieved from "https://en.wikipedia.org/w/index.php?title=List_of_misidentified_chemical_elements&oldid=1060414314".
  8. The nonmetals or non-metals are a group of elements located on the right side of the periodic table (except for hydrogen, which is on the top left).

Are There Any Undiscovered Elements?

  • These elements are distinctive in that they typically have low melting and boiling points, don't conduct heat or electricity very well, and tend to have high ionization energies and electronegativity values.
  • They also don't have the shiny "metallic" appearance associated with the metals.
While the metals are malleable and ductile, the nonmetals tend to form brittle solids.