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The elements of the periodic table.
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| x name | x image | x CAS ID | x Symbol | x Atomic number | x article |
| x Helium |
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7440-59-7 | He | 2 |
Helium (pronounced /ˈhiːliəm/, HEE-lee-əm) is the chemical element with atomic number 2, and is represented by the symbol He. It is a colorless, odorless, tasteless, non-toxic, inert monatomic gas that heads the noble gas group in the periodic table...
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| x Hassium |
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54037-57-9 | Hs | 108 |
Hassium (pronounced /ˈhæsiəm/ ( listen) HAS-ee-əm or /ˈhɑːsiəm/ HAH-see-əm) is a synthetic element with the symbol Hs and atomic number 108 and is the heaviest member of the group 8 (VIII) elements. The element was first observed in 1984.
Several...
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| x Argon |
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7440-37-1 | Ar | 18 |
Argon (pronounced /ˈɑrɡɒn/) is a chemical element designated by the symbol Ar. Argon has atomic number 18 and is the third element in group 18 of the periodic table (noble gases). Argon is present in the Earth's atmosphere at 0.93%. It is the third...
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| x Strontium |
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7440-24-6 | Sr | 38 |
Strontium (pronounced /ˈstrɒnʃiəm/ STRON-shee-əm, /ˈstrɒntiəm/ STRON-tee-əm, or /ˈstrɒnʃəm/ STRON-shəm) is a chemical element with the symbol Sr and the atomic number 38. An alkaline earth metal, strontium is a soft silver-white or yellowish...
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| x Polonium |
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7440-08-6 | Po | 84 |
Polonium (pronounced /pɵˈloʊniəm/, po-LOH-nee-əm) is a chemical element with the symbol Po and atomic number 84, discovered in 1898 by Marie and Pierre Curie. A rare and highly radioactive metalloid, polonium is chemically similar to bismuth and...
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| x Selenium |
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7782-49-2 | Se | 34 |
Selenium (pronounced /sɨˈliːniəm/ sə-LEE-nee-əm) is a chemical element with the atomic number 34, represented by the chemical symbol Se, an atomic mass of 78.96. It is a nonmetal, chemically related to sulfur and tellurium, and rarely occurs in its...
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| x Xenon |
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7440-63-3 | Xe | 54 |
Xenon (pronounced /ˈzɛnɒn/ ZEN-on or /ˈziːnɒn/ ZEE-non) is a chemical element represented by the symbol Xe. Its atomic number is 54. A colorless, heavy, odorless noble gas, xenon occurs in the Earth's atmosphere in trace amounts. Although generally...
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| x Silicon |
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7440-21-3 | Si | 14 |
Silicon (pronounced /ˈsɪlɨkən/ SIL-ə-kən or /ˈsɪlɨkɒn/ SIL-ə-kon, Latin: silicium) is the most common metalloid. It is a chemical element, which has the symbol Si and atomic number 14. A tetravalent metalloid, silicon is less reactive than its...
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| x Ununpentium |
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54085-64-2 | Uup | 115 |
Ununpentium (pronounced /uːnuːnpɛntiəm/ ( listen) oon-oon-PEN-tee-əm) is the temporary name of a synthetic superheavy element in the periodic table that has the temporary symbol Uup and has the atomic number 115.
It is placed as the heaviest member...
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| x Protactinium |
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7440-13-3 | Pa | 91 |
Protactinium (pronounced /ˌproʊtækˈtɪniəm/, PROH-tak-TIN-ee-əm) is a chemical element with the symbol Pa and atomic number 91. Its longest-lived and most abundant naturally-occurring isotope by far, Pa-231, is a decay product of uranium-235 (U-235),...
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| x Dysprosium |
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7429-91-6 | Dy | 66 |
Dysprosium (pronounced /dɪsˈproʊziəm/, dis-PROE-zee-əm) is a chemical element with the symbol Dy and atomic number 66. It is a rare earth element with a metallic silver luster. Dysprosium is never found in nature as a free element, though it is...
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| x Plutonium |
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7440-07-5 | Pu | 94 |
Plutonium (pronounced /pluːˈtoʊniəm/ ploo-TOH-nee-əm, symbol Pu, atomic number 94) is a rare transuranic radioactive element. It is an actinide metal of silvery-white appearance that tarnishes when exposed to air, forming a dull coating when...
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| x Nitrogen |
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7727-37-9 | N | 7 |
Nitrogen (pronounced /ˈnaɪtrɵdʒɨn/ NYE-tro-jin) is a chemical element that has the symbol N and atomic number 7 and atomic mass 14.00674 u. Elemental nitrogen is a colorless, odorless, tasteless and mostly inert diatomic gas at standard conditions,...
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| x Iodine |
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7553-56-2 | I | 53 |
Iodine (pronounced /ˈaɪ.ɵdaɪn/ EYE-o-dyne, /ˈaɪ.ɵdɨn/ EYE-o-dən, or in chemistry /ˈaɪ.ɵdiːn/ EYE-o-deen; from Greek: ιώδης iodes "violet"), is a chemical element that has the symbol I and atomic number 53. Naturally-occurring iodine is a single...
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| x Carbon |
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7440-44-0 | C | 6 |
Carbon (pronounced /ˈkɑrbən/) is the chemical element with symbol C and atomic number 6. As a member of group 14 on the periodic table, it is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. There are...
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| x Thallium |
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7440-28-0 | Tl | 81 |
Thallium (pronounced /ˈθæliəm/, THAL-ee-əm) is a chemical element with the symbol Tl and atomic number 81. This soft gray malleable poor metal resembles tin but discolors when exposed to air. Approximately 60-70% of thallium production is used in...
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| x Beryllium |
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7440-41-7 | Be | 4 |
Beryllium (pronounced /bəˈrɪliəm/, bə-RIL-ee-əm) is the chemical element with the symbol Be and atomic number 4.
A bivalent element, beryllium is found naturally only combined with other elements in minerals. Notable gemstones which contain...
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| x Meitnerium |
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54038-01-6 | Mt | 109 |
Meitnerium (pronounced /maɪtˈnɜriəm/ ( listen) myet-NAIR-ee-əm) is a chemical element with the symbol Mt and atomic number 109. It is placed as the heaviest member of group 9 (or VIII) in the periodic table but a sufficiently stable isotope is not...
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| x Chromium |
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7440-47-3 | Cr | 24 |
Chromium (pronounced /ˈkroʊmiəm/, KROH-mee-əm) is a chemical element which has the symbol Cr and atomic number 24, first element in Group 6. It is a steely-gray, lustrous, hard metal that takes a high polish and has a high melting point. It is also...
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| x Mercury |
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7439-97-6 | Hg | 80 |
Mercury (pronounced /ˈmɜrkjʊri/ MER-kyə-ree), also called quicksilver (/ˈkwɪksɪlvər/) or hydrargyrum (/haɪˈdrɑrdʒɨrəm/ hye-DRAR-ji-rəm), is a chemical element with the symbol Hg (Latinized Greek: hydrargyrum, meaning watery or liquid silver) and...
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| x Yttrium |
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7440-65-5 | Y | 39 |
Yttrium (pronounced /ˈɪtriəm/ IT-ree-əm) is a chemical element with symbol Y and atomic number 39. It is a silvery-metallic transition metal chemically similar to the lanthanoids and has historically been classified as a rare earth element. Yttrium...
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| x Scandium |
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7440-20-2 | Sc | 21 |
Scandium (pronounced /ˈskændiəm/, SKAN-dee-əm) is a chemical element with symbol Sc and atomic number 21. A silvery-white metallic transition metal, it has historically been sometimes classified as a rare earth element, together with yttrium and the...
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| x Tellurium |
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13494-80-9 | Te | 52 |
Tellurium (pronounced /tɪˈlʊəriəm, tɛ-/ te-LOOR-ee-əm) is a chemical element that has the symbol Te and atomic number 52. A brittle, mildly toxic, silver-white metalloid which looks similar to tin, tellurium is chemically related to selenium and...
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| x Astatine |
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7440-68-8 | At | 85 |
Astatine (pronounced /ˈæstətiːn/ AS-tə-teen or /ˈæstətɨn/ AS-tətin) is a radioactive chemical element with the symbol At and atomic number 85. It is the heaviest of the discovered halogens. Although astatine is produced by radioactive decay in...
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| x Lead |
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7439-92-1 | Pb | 82 |
Lead (pronounced /ˈlɛd/, led) is a main-group element with symbol Pb (Latin: plumbum) and atomic number 82. Lead is a soft, malleable poor metal, also considered to be one of the heavy metals. Lead has a bluish-white color when freshly cut, but...
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| x Iron |
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7439-89-6 | Fe | 26 |
Iron (pronounced /ˈаɪ.ərn/) is a metallic chemical element with the symbol Fe (Latin: ferrum) and atomic number 26. Iron is a group 8 and period 4 element and is therefore classified as a transition metal. Iron and iron alloys (steels) are by far...
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| x Berkelium |
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7440-40-6 | Bk | 97 |
Berkelium (pronounced /bərˈkiːli.əm/ bər-KEE-lee-əm, less commonly /ˈbɜrkli.əm/ BERK-lee-əm) is a synthetic element with the symbol Bk and atomic number 97. A radioactive metallic element in the actinide series, berkelium was first synthesized by...
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| x Platinum |
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7440-06-4 | Pt | 78 |
Platinum (pronounced /ˈplætɨnəm/, PLAT-ə-nəm) is a chemical element with the chemical symbol Pt and an atomic number of 78. Its name is derived from the Spanish term platina del Pinto, which is literally translated into "little silver of the Pinto...
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| x Dubnium |
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53850-35-4 | Db | 105 |
Dubnium (pronounced /ˈduːbniəm/, DOOB-nee-əm) is a chemical element with the symbol Db and atomic number 105.
This is a radioactive synthetic element whose most stable isotope is Db with a half life of 28 hours. An element of with a half-life as...
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| x Seaborgium |
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54038-81-2 | Sg | 106 |
Seaborgium (pronounced /siːˈbɔrɡiəm/ ( listen), see-BOR-gee-əm) is a chemical element with the symbol Sg and atomic number 106.
Seaborgium is a synthetic element whose most stable isotope Sg has a half-life of 1.9 minutes. Chemistry experiments with...
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| x Rutherfordium |
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53850-36-5 | Rf | 104 |
Rutherfordium (pronounced /ˌrʌðərˈfɔrdiəm/ RUDH-ər-FOR-dee-əm) is a chemical element with the symbol Rf and atomic number 104. This is a radioactive synthetic element whose most stable known isotope is Rf with a half-life of approximately 1.3 hours....
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| x Tin |
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7440-31-5 | Sn | 50 |
Tin is a chemical element with the symbol Sn (Latin: Stannum) and atomic number 50. It is a main group metal in group 14 of the periodic table. Tin shows chemical similarity to both neighboring group 14 elements, germanium and lead, like the two...
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| x Cerium |
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7440-45-1 | Ce | 58 |
Cerium (pronounced /ˈsɪəriəm/) is a chemical element with the symbol Ce and atomic number 58. It is a soft, silvery, ductile metal which easily oxidizes in air. Cerium was named after the dwarf planet Ceres. Cerium is the most abundant of the rare...
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| x Oxygen |
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7782-44-7 | O | 8 |
Oxygen (pronounced /ˈɒksɨdʒɨn/, OK-si-jin, from the Greek roots ὀξύς (oxys) (acid, literally "sharp", from the taste of acids) and -γενής (-genēs) (producer, literally begetter) is the element with atomic number 8 and represented by the symbol O. It...
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| x Fluorine |
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7782-41-4 | F | 9 |
Fluorine is the chemical element with atomic number 9, represented by the symbol F. Fluorine forms a single bond with itself in elemental form, resulting in the diatomic F2 molecule. F2 is a supremely reactive, poisonous, pale, yellowish brown gas....
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| x Gallium |
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7440-55-3 | Ga | 31 |
Gallium (pronounced /ˈɡæliəm/, GAL-ee-əm) is a chemical element that has the symbol Ga and atomic number 31. Elemental gallium does not occur in nature, but as the gallium(III) salt in trace amounts in bauxite and zinc ores. A soft silvery metallic...
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| x Ytterbium |
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7440-64-4 | Yb | 70 |
Ytterbium (pronounced /ɨˈtɜrbiəm/, i-TER-bee-əm) is a chemical element with the symbol Yb and atomic number 70. A soft silvery metallic element, ytterbium is a rare earth of the lanthanide series and is found in the minerals gadolinite, monazite,...
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| x Neon |
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7440-01-9 | Ne | 10 |
Neon (pronounced /ˈniːɒn/) is the chemical element that has the symbol Ne and atomic number 10. Although a very common element in the universe, it is rare on Earth. A colorless, inert noble gas under standard conditions, neon gives a distinct...
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| x Tungsten |
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7440-33-7 | W | 74 |
Tungsten (pronounced /ˈtʌŋstən/), also known as wolfram (/ˈwʊlfrəm/, WOOL-frəm), is a chemical element with the chemical symbol W and atomic number 74.
A steel-gray metal, tungsten is found in several ores, including wolframite and scheelite. It is...
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| x Rhenium |
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7440-15-5 | Re | 75 |
Rhenium (pronounced /ˈriːniəm/, REE-nee-əm) is a chemical element with the symbol Re and atomic number 75. It is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. With an average concentration of 1 part per billion...
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| x Zinc |
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7440-66-6 | Zn | 30 |
Zinc (pronounced /ˈzɪŋk/ zingk, from German: Zink), also known as spelter, is a metallic chemical element; it has the symbol Zn and atomic number 30. It is the first element in group 12 of the periodic table. Zinc is, in some respects, chemically...
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| x Uranium |
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7440-61-1 | U | 92 |
Uranium (pronounced /jʊˈreɪniəm/ yoo-RAY-nee-əm) is a silvery-white metallic chemical element in the actinide series of the periodic table that has the symbol U and atomic number 92. Besides its 92 protons, a uranium nucleus can have between 141 and...
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| x Ununhexium |
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54100-71-9 | Uuh | 116 |
Ununhexium (pronounced /uːnuːnˈhɛksiəm/ ( listen) oon-oon-HEKS-ee-əm) is the temporary name of a synthetic superheavy element with the temporary symbol Uuh and atomic number 116.
It is placed as the heaviest member of group 16 (VIA) although a...
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| x Roentgenium |
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54386-24-2 | Rg | 111 |
Roentgenium (pronounced /rɛntˈɡɛniəm/ or /rʌntˈɡɛniəm/ ( listen)) is a synthetic radioactive chemical element with the symbol Rg and atomic number 111. It is placed as the heaviest member of the group 11 (IB) elements, although a sufficiently...
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| x Curium |
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7440-51-9 | Cm | 96 |
Curium (pronounced /ˈkjʊəriəm/ KEWR-ee-əm) is a synthetic chemical element with the symbol Cm and atomic number 96. A radioactive metallic transuranic element of the actinide series, curium is produced by bombarding plutonium with alpha particles ...
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| x Antimony |
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7440-36-0 | Sb | 51 |
Antimony (pronounced /ˈæntɨmɵnɪ/ AN-ti-mo-nee) is a chemical element with the symbol Sb (Latin: stibium, meaning "mark") and atomic number 51. A metalloid, antimony has four allotropic forms. The stable form of antimony is a blue-white metalloid....
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| x Ruthenium |
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7440-18-8 | Ru | 44 |
Ruthenium (pronounced /ruːˈθiːniəm/ roo-THEE-nee-əm) is a chemical element that has the symbol Ru and atomic number 44. A rare transition metal of the platinum group of the periodic table, ruthenium is found associated with platinum ores and used as...
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| x Vanadium |
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7440-62-2 | V | 23 |
Vanadium (pronounced /vəˈneɪdiəm/, və-NAY-dee-əm) is the chemical element with the symbol V and atomic number 23. It is a soft, silvery grey, ductile transition metal. The formation of an oxide layer stabilizes the metal against oxidation. Andrés...
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| x Niobium |
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7440-03-1 | Nb | 41 |
Niobium (pronounced /naɪˈoʊbiəm/ nye-OH-bee-əm) (Greek mythology: Niobe, daughter of Tantalus), or columbium (/kəˈlʌmbiəm/ kə-LUM-bee-əm), is the chemical element with the symbol Nb and the atomic number 41. A rare, soft, grey, ductile transition...
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| x Praseodymium |
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7440-10-0 | Pr | 59 |
Praseodymium (pronounced /ˌpreɪzi.ɵˈdɪmiəm/ PRAY-zee-o-DIM-ee-əm or /ˌpreɪsi.ɵˈdɪmiəm/ PRAY-see-o-DIM-ee-əm) is a chemical element that has the symbol Pr and atomic number 59.
Praseodymium is a soft, silvery, malleable and ductile metal in the...
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| x Americium |
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7440-35-9 | Am | 95 |
Americium (pronounced /ˌæməˈrɪsiəm/, AM-ə-RIS-ee-əm) is a synthetic element that has the symbol Am and atomic number 95. A radioactive metallic element, americium is an actinide that was obtained in 1944 by Glenn T. Seaborg who was bombarding...
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| x Osmium |
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7440-04-2 | Os | 76 |
Osmium (pronounced /ˈɒzmiəm/, OZ-mee-əm) is a chemical element that has the symbol Os and atomic number 76. Osmium is a hard, brittle, blue-gray or blue-black transition metal in the platinum family, and is the densest natural element, making it...
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| x Neptunium |
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7439-99-8 | Np | 93 |
Neptunium (pronounced /nɛpˈtjuːniəm/, nep-TEW-nee-əm) is a chemical element with the symbol Np and atomic number 93. A radioactive metallic element, neptunium is the first transuranic element and belongs to the actinide series. Its most stable...
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| x Magnesium |
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7439-95-4 | Mg | 12 |
Magnesium (pronounced /mæɡˈniːziəm/, mag-NEE-zee-əm) is a chemical element with the symbol Mg, atomic number 12 and common oxidation number +2. It is an alkaline earth metal and the eighth most abundant element in the earth's crust by mass, although...
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| x Silver |
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7440-22-4 | Ag | 47 |
Silver is a chemical element with the chemical symbol Ag (Latin: argentum) and atomic number 47. A soft, white, lustrous transition metal, it has the highest electrical conductivity of any element and the highest thermal conductivity of any metal....
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| x Phosphorus |
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7723-14-0 | P | 15 |
Phosphorus (pronounced /ˈfɒsfərəs/, FOS-fər-əs) is the chemical element that has the symbol P and atomic number 15. A multivalent nonmetal of the nitrogen group, phosphorus is commonly found in inorganic phosphate rocks. Elemental phosphorus exists...
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| x Nobelium |
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10028-14-5 | No | 102 |
Nobelium (pronounced /noʊˈbɛliəm/ noh-BEL-ee-əm or /noʊˈbiːliəm/ noh-BEE-lee-əm) is a synthetic element with the symbol No and atomic number 102. It was first correctly identified in 1956 by scientists at the Flerov Laboratory of Nuclear Reactions...
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| x Hafnium |
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7440-58-6 | Hf | 72 |
Hafnium (pronounced /ˈhæfniəm/, HAF-nee-əm) is a chemical element with the symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in zirconium minerals. Its...
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| x Calcium |
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7440-70-2 | Ca | 20 |
Calcium (pronounced /ˈkælsiəm/, KAL-see-əm) is the chemical element with the symbol Ca and atomic number 20. It has an atomic mass of 40.078 amu. Calcium is a soft grey alkaline earth metal, and is the fifth most abundant element by mass in the...
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| x Fermium |
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7440-72-4 | Fm | 100 |
Fermium (pronounced /ˈfɜrmiəm/, FER-mee-em) is a synthetic element with the symbol Fm and atomic number 100. A highly radioactive metallic transuranic element of the actinide series, fermium is made by bombarding plutonium with neutrons and is named...
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