n
(chemistry, dated) Any of the 14 elements from thorium to lawrencium (actinium having been mistakenly excluded because it was thought to be a d-block element in the past).
n
A radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores.
n
(physics, dated) An actinide
n
Alternative spelling of actino-uranium [Uranium-235.]
n
A light, silvery metal extracted from bauxite, and a chemical element (symbol Al) with an atomic number of 13.
n
US and Canadian standard spelling of aluminium.
n
The chemical element (symbol Am) with an atomic number of 95.
n
The chemical element (symbol Ar) with an atomic number of 18. The third most abundant gas in the Earth's atmosphere, it is a colourless, odourless, inert noble gas.
n
A highly radioactive chemical element (symbol At), one of the halogens, with atomic number 85.
n
A supposed chemical element proposed by Eduard Linnemann in 1886, later found to be gallium.
n
A fictional chemical element.
n
The chemical element (symbol Ba) with an atomic number of 56. It is a soft, reactive, silvery alkaline earth metal.
n
A transuranic chemical element (symbol Bk) with an atomic number of 97.
n
The chemical element (symbol Be) with an atomic number of 4; a soft silvery-white low density alkaline earth metal with specialist industrial applications.
n
A transuranic chemical element (symbol Bh) with an atomic number of 107.
n
(obsolete) ²³⁴₉₁Pa, a short-lived isotope of protactinium.
n
(art) Abbreviation of cadmium. [A chemical element (symbol Cd) with an atomic number of 48: a soft, silvery-white metal. # (countable) A single atom of this element.]
n
A chemical element (symbol Cd) with an atomic number of 48: a soft, silvery-white metal. # (countable) A single atom of this element.
n
The chemical element (symbol Cs) with an atomic number of 55. It is a soft, gold-colored, highly reactive alkali metal.
n
A strongly radioactive and highly fissile transuranic chemical element (symbol Cf) with an atomic number of 98.
n
(obsolete) A supposed chemical element of the rare earth group (proposed symbol Ct), later determined to be identical to lutetium.
n
A chemical element (symbol Ce) with an atomic number of 58, a very soft, ductile, silvery-white metal that tarnishes when exposed to air.
n
(American spelling) Alternative form of caesium [The chemical element (symbol Cs) with an atomic number of 55. It is a soft, gold-colored, highly reactive alkali metal.]
n
A chemical element (symbol Cr) with an atomic number of 24: a steely-grey, lustrous, hard and brittle transition metal.
n
A chemical element (symbol Co) with an atomic number of 27: a hard, lustrous, silver-gray metal.
n
2013, Eric Scerri, 30-Second Elements, →ISBN:
n
(historical) A supposed chemical element, hypothesized in the 19th century in order to explain a green emission line seen during the total solar eclipse of 7 August 1869 (actually highly ionized iron).
n
Alternative spelling of caesium [The chemical element (symbol Cs) with an atomic number of 55. It is a soft, gold-colored, highly reactive alkali metal.]
n
A transuranic chemical element (symbol Ds) with atomic number 110.
n
A mixture of praseodymium and neodymium once thought to be an element (symbol Di).
adj
(physics, of a transuranic nuclide) Having filled shells of both protons and neutrons and therefore having extra stability and a longer half-life than normal.
n
A transuranic chemical element (symbol Db) with atomic number 105.
n
(chemistry, obsolete) Any of the four metals aluminum, gallium, indium and thallium of the boron group in the periodic table of elements.
n
A transuranic chemical element (symbol Es) with atomic number 99: a soft, silvery, paramagnetic metal.
n
(chemistry, archaic) rutherfordium
n
(chemistry, archaic) astatine
n
Unbitrium (Ubt), an unsynthesized chemical element with atomic number 123.
n
(chemistry, archaic) seaborgium
n
Alternative spelling of eka-aluminium [(chemistry, archaic) gallium]
n
(chemistry) the name given by Dmitri Mendeleev to the predicted element (scandium) lying below boron in the periodic table
n
Alternative form of eka-caesium [(obsolete) Francium.]
n
Alternative spelling of eka-mercury [copernicium.]
n
Alternative form of eka-tantalum [(chemistry, archaic) dubnium]
n
A chemical element (symbol Er) with atomic number 68: a silvery-white metal, in nature always found in combination with other elements.
n
A metallic chemical element (symbol Eu) with an atomic number of 63.
n
A transuranic chemical element (symbol Fm) with an atomic number of 100.
n
The hypothetical chemical element with atomic number 137.
n
The chemical element with atomic number 114.
n
The chemical element (symbol Fr) with an atomic number of 87. It is an intensely radioactive alkali metal that is not found in nature.
n
A chemical element (symbol Gd) with atomic number 64: a ductile silvery-white metal.
n
A chemical element (symbol Ga) with an atomic number of 31; a soft bluish metal.
n
A chemical element (symbol Hf) with an atomic number of 72: a lustrous, silvery-grey tetravalent transition metal.
n
An artificially-produced transuranic chemical element (symbol Hs) with atomic number 108.
n
Proposed name for the chemical element astatine.
n
A chemical element (symbol Ho) with atomic number 67: a soft and malleable silvery-white metal, too reactive to be found uncombined in nature.
n
A chemical element (symbol In) with an atomic number of 49: a soft silvery-white metal.
n
(uncountable) A chemical element (symbol Ir) with an atomic number of 77: a very hard, brittle, silvery-white transition metal of the platinum group.
n
(physics) A minor stable isotope of iron, ⁵⁸₂₆Fe, having 26 protons and 32 neutrons; it amounts to about 0.3% of the element in nature
n
The chemical element (symbol Kr) with an atomic number of 36. It is a colourless, odourless noble gas that only reacts with fluorine. It is one of the rarest gases in the Earth's atmosphere.
n
(chemistry) Any of the 15 rare earth elements from lanthanum to lutetium in the periodic table; because their outermost orbitals are not filling, they have very similar chemistry; below them are the actinides.
n
(UK) Alternative form of lanthanum [(uncountable) A chemical element (symbol La) with an atomic number of 57: a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air.]
n
(uncountable) A chemical element (symbol La) with an atomic number of 57: a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air.
n
A transuranic chemical element (symbol Lr, formerly Lw) with atomic number 103.
n
(uncountable) The simplest alkali metal, the lightest solid element, and the third lightest chemical element (symbol Li) with an atomic number of 3. It is a soft, silvery metal.
n
The chemical element with atomic number 116 (symbol Lv).
n
Obsolete form of lutetium. [A chemical element (symbol Lu) with an atomic number of 71, a silvery-white metal which resists corrosion in dry air.]
n
A chemical element (symbol Lu) with an atomic number of 71, a silvery-white metal which resists corrosion in dry air.
n
The chemical element (symbol Mg) with an atomic number of 12. It is a light, easily flammable, silvery-white alkaline earth metal.
n
(chemistry, dated) The same, plus the elements of group 12.
n
(obsolete) The metallic element technetium.
n
A transuranic chemical element (symbol Mt) with atomic number 109.
n
(chemistry) A transuranic chemical element (symbol Md, formerly Mv) with atomic number 101.
n
A heavy isotope of the simplest alkali metal, (symbol Li) with an atomic number of 3 and containing 8 neutrons. Metalithium is an artificial isotope produced by bombarding Lithium 7 with neutrons. It is radioactive, with a half-life of 0.84 seconds.
n
A chemical element (symbol Mo) with an atomic number of 42: a silvery metal, not found as a free element, used in steel alloys.
n
The chemical element with atomic number 115.
n
Alternative form of moscovium [The chemical element with atomic number 115.]
n
Obsolete form of neodymium. [A chemical element (symbol Nd) with an atomic number of 60: a hard, slightly malleable silvery metal that quickly tarnishes in air and moisture.]
n
A chemical element (symbol Nd) with an atomic number of 60: a hard, slightly malleable silvery metal that quickly tarnishes in air and moisture.
n
The transuranic chemical element with atomic number 93 and symbol Np.
n
The synthetic transactinide chemical element with atomic number 113.
n
A chemical element (symbol Nb) with an atomic number of 41: a light grey, crystalline, ductile transition metal used in superconducting materials.
n
(dated) A chemical element, supposed to be the then-undiscovered technetium, but later identified as rhenium.
n
a transuranic chemical element (symbol No) with an atomic number of 102.
n
(obsolete) A supposed chemical element, thought to be the one with atomic number 72 (now known as hafnium), but later identified as a mixture of aluminium, iron, and titanium.
n
The chemical element (Symbol Og) with atomic number 118. It is the heaviest known element. Highly radioactive, it does not occur naturally. Originally expected to be a noble gas, it is now predicted to be a reactive metallic solid, and a semiconductor or a post-transition metal.
n
A chemical element (symbol Os) with atomic number 76: a hard, brittle, heavy, bluish-white transition metal found as a trace element in alloys, mostly in platinum ores.
n
The chemical element with atomic number 78 and symbol Pt; a dense, malleable, ductile, highly unreactive, silverish-white transition metal of great value.
n
The transuranic chemical element with atomic number 94 and symbol Pu: a silvery-gray fissile radioactive actinide metal that tarnishes when exposed to air.
n
A rare, highly radioactive chemical element (symbol Po) with atomic number 84.
n
A soft, waxy, silvery reactive metal that is never found unbound in nature; an element (symbol K) with an atomic number of 19 and atomic weight of 39.0983. The symbol is derived from the Latin kalium.
n
Alternative spelling of praseodymium [A chemical element (symbol Pr) with an atomic number of 59, a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties.]
n
Obsolete form of praseodymium. [A chemical element (symbol Pr) with an atomic number of 59, a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties.]
n
A chemical element (symbol Pr) with an atomic number of 59, a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties.
n
A metallic chemical element (symbol Pm) with an atomic number of 61.
n
A chemical element (symbol Pa) with atomic number 91: a dense, silvery-gray actinide metal.
n
(chemistry) Any group of the extended periodic table containing lanthanides or actinides
n
The chemical element (symbol Ra) with an atomic number of 88. It is a soft, shiny and silvery radioactive alkaline earth metal.
n
The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas.
n
Alternative form of rare earth element [(chemistry) Any of a group of seventeen soft, lustrous, sometimes magnetic metals that form trivalent salts; they include the lanthanides plus yttrium, scandium, thorium and sometimes zirconium.]
n
(geology) Initialism of rare earth element. [(chemistry) Any of a group of seventeen soft, lustrous, sometimes magnetic metals that form trivalent salts; they include the lanthanides plus yttrium, scandium, thorium and sometimes zirconium.]
n
A metallic chemical element (symbol Re) with an atomic number of 75: a heavy, silvery-gray transition metal.
n
A rare, hard, silvery-white, inert metallic chemical element (symbol Rh) with an atomic number of 45.
n
A transuranic chemical element (symbol Rg) with atomic number 111.
n
The chemical element (symbol Rb) with an atomic number of 37. It is a soft, highly reactive alkali metal.
n
A metallic chemical element (symbol Ru) with an atomic number of 44.
n
A transuranic chemical element (symbol Rf) with an atomic number of 104.
n
A chemical element (symbol Sm) with an atomic number of 62, a moderately hard silvery metal that slowly oxidizes in air.
n
A metallic chemical element, atomic number 21, obtained from some uranium ores; it is a transition element.
n
A transuranic chemical element (symbol Sg) with atomic number 106
n
Initialism of superheavy element. [(physics) an element with an extremely high atomic number; typically taken to mean beyond lawrencium (element 103, the last actinide)]
n
The metallic chemical element (symbol Sr) with an atomic number of 38. It is a soft, reactive, silvery alkaline earth metal.
n
(chemistry) Any of the undiscovered chemical elements from unbiunium (121) to unpentseptium (157), following the transactinides.
adj
(physics) Describing a transuranic element with an extremely high atomic number; typically taken to mean beyond lawrencium (element 103, the last actinide)
n
(physics) an element with an extremely high atomic number; typically taken to mean beyond lawrencium (element 103, the last actinide)
n
(chemistry) A systematic name for an element, derived from the digits of its atomic number to which the suffix -(i)um is appended; normally only used for transuranic elements before or for a short period after they have been created, after which they will be given a non-systematic name.
n
A chemical element (symbol Ta) with atomic number 73: a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant.
n
A metallic chemical element (symbol Tc) with an atomic number of 43.
n
(uncountable) The chemical element with atomic number 52. Symbol: Te. A rare, brittle, mildly toxic, silver-white metalloid.
n
The chemical element (halogen) with atomic number 117
n
A metallic chemical element (symbol Tb) with an atomic number of 65: a soft, silvery-white, rare earth metal that is malleable and ductile.
n
A (fictional) element, especially a metal.
n
A metallic chemical element (symbol Tl) with atomic number 81: a gray post-transition metal that discolors when exposed to air.
n
(chemistry) A highly toxic indicator used in the determination of barium, beryllium, lithium, uranium and thorium compounds.
n
A chemical element (symbol Th) with atomic number 90: a weakly radioactive, malleable, moderately hard silvery metal that tarnishes black when exposed to air.
n
A metallic chemical element (symbol Tm) with atomic number 69: a fairly soft, easily workable metal with a bright silvery-gray lustre.
n
(uncountable) A malleable, ductile, metallic element, resistant to corrosion, with atomic number 50 and symbol Sn.
n
A chemical element, atomic number 22; it is a strong, corrosion-resistant transition metal, used to make light alloys for aircraft etc.
adj
(chemistry) Lying beyond copernicium in the periodic table; having an atomic number greater than 112.
n
(chemistry, physics) Any of the artificially produced elements having an atomic number greater than 103.
adj
(physics, chemistry) Describing any element that lies beyond fermium in the periodic table
n
(chemistry, dated) The same, but excluding the group 12 elements (i.e. groups 3 to 11 inclusive).
adj
(physics, chemistry, of an atom) Lying beyond lawrencium in the periodic table.
adj
(chemistry) Coming after lead in the periodic table, i.e. having an atomic number greater than 82.
adj
(physics, chemistry) Describing elements having an atomic number greater than that of plutonium (94)
n
(chemistry) Any element having an atomic number greater than that of uranium.
n
An atom of this isotope.
n
A rare metallic chemical element (symbol W, from Latin wolframium) with an atomic number of 74.
n
Abbreviation of uranium-235. [(physics) A fissile isotope of uranium, used for energy generation and in atomic weapons, containing one hundred and forty-three neutrons. It has a half-life of 7·038×10⁸ years; it decays into thorium-231 and ultimately lead.]
n
The systematic element name for the (as yet undiscovered) chemical element with atomic number 122 (symbol Ubb).
n
The systematic element name for the (as yet undiscovered) chemical element with atomic number 129 (symbol Ube).
n
The systematic element name for the (as yet undiscovered) chemical element with atomic number 126 (symbol Ubh).
n
The systematic element name for the (as yet undiscovered) chemical element with atomic number 120 (symbol Ubn).
n
The systematic element name for the (as yet undiscovered) chemical element with atomic number 128 (symbol Ubo).
n
The systematic element name for the (as yet undiscovered) chemical element with atomic number 125 (symbol Ubp).
n
The systematic element name for the (as yet undiscovered) chemical element with atomic number 124 (symbol Ubq).
n
The systematic element name for the (as yet undiscovered) chemical element with atomic number 127 (symbol Ubs).
n
The systematic element name for the (as yet undiscovered) chemical element with atomic number 123 (symbol Ubt).
n
The systematic element name for the (as yet undiscovered) chemical element with atomic number 121 (symbol Ubu).
n
The systematic element name for the (as yet undiscovered) chemical element with atomic number 130 (symbol Utn).
n
The former systematic element name for the chemical element with atomic number 112 (symbol Uub), which has been officially changed to copernicium. #:
n
The systematic element name for the (as yet undiscovered) chemical element with an atomic number of 119 (symbol Uue).
n
(dated) The previous systematic element name for livermorium, the chemical element with atomic number 116 (symbol Uuh).
n
(dated) The systematic element name for the chemical element with atomic number 118 (symbol Uuo). The element is now named oganesson.
n
(dated) The systematic element name for the chemical element with atomic number 115 (symbol Uup). The element is now named moscovium.
n
(dated) The systematic element name for flerovium, the chemical element with atomic number 114 (symbol Uuq).
n
(dated) The systematic element name for the chemical element with atomic number 117 (symbol Uus). The element is now named tennessine.
n
(dated) The systematic element name for the chemical element with atomic number 113 (symbol Uut). The element is now named nihonium.
n
(chemistry) Any of the transuranium elements immediately following uranium in the periodic table.
n
The element with atomic number 92 and symbol U: a radioactive silvery-grey metal in the actinide series.
n
A chemical element (symbol V) with atomic number 23; it is a transition metal, used in the production of special steels.
n
(historical) A supposed chemical element, afterward found to be a mixture of several metals, such as copper, iron, lead, nickel, etc.
n
(obsolete) The chemical element wolfram or tungsten.
n
The chemical element (symbol Xe) with an atomic number of 54. It is a colorless, odorless, unreactive noble gas, used notably in camera flash technology.
n
A metallic chemical element (symbol Yb) with an atomic number of 70.
n
A silvery metallic chemical element (symbol Y) with an atomic number of 39, mainly found in combination with lanthanide elements in rare-earth minerals.
n
A chemical element (symbol Zn) with an atomic number of 30, a slightly brittle blue-silvery metal.
n
A chemical element (symbol Zr) with an atomic number of 40, a strong, lustrous, grey-white transition metal mainly used as a refractory and opacifier.
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