Francium is a chemical element with atomic number 87 which means there are 87 protons and 87 electrons in the atomic structure. The chemical symbol for Francium is Fr. Francium is an alkali metal, that has one valence electron. Francium is the second-least electronegative element, behind only caesium, and is the second rarest naturally occurring element after astatine.
Francium is a highly radioactive metal that decays into astatine, radium, and radon. Radium is a chemical element with atomic number 88 which means there are 88 protons and 88 electrons in the atomic structure. The chemical symbol for Radium is Ra.
Pure radium is silvery-white alkaline earth metal. All isotopes of radium are highly radioactive, with the most stable isotope being radium Lanthanum is a chemical element with atomic number 57 which means there are 57 protons and 57 electrons in the atomic structure.
The chemical symbol for Lanthanum is La. Lanthanum is a soft, ductile, silvery-white metal that tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. It is the eponym of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table, of which lanthanum is the first and the prototype.
It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements. Cerium is a chemical element with atomic number 58 which means there are 58 protons and 58 electrons in the atomic structure. The chemical symbol for Cerium is Ce. Cerium is a soft, ductile and silvery-white metal that tarnishes when exposed to air, and it is soft enough to be cut with a knife. Cerium is the second element in the lanthanide series.
Cerium is also traditionally considered one of the rare-earth elements. Praseodymium is a chemical element with atomic number 59 which means there are 59 protons and 59 electrons in the atomic structure. The chemical symbol for Praseodymium is Pr. Praseodymium is a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties.
Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals. Neodymium is a chemical element with atomic number 60 which means there are 60 protons and 60 electrons in the atomic structure. The chemical symbol for Neodymium is Nd. Neodymium is a soft silvery metal that tarnishes in air. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use.
Although neodymium is classed as a rare earth, it is a fairly common element. Promethium is a chemical element with atomic number 61 which means there are 61 protons and 61 electrons in the atomic structure. The chemical symbol for Promethium is Pm. Promethium is one of only two such elements that are followed in the periodic table by elements with stable forms. All of its isotopes are radioactive. In nuclear reactors, promethium equilibrium exists in power operation.
Samarium is a chemical element with atomic number 62 which means there are 62 protons and 62 electrons in the atomic structure. The chemical symbol for Samarium is Sm. Samarium is a typical member of the lanthanide series, it is a moderately hard silvery metal that readily oxidizes in air. The name samarium is after the mineral samarskite from which it was isolated. In nuclear industry, especially natural and artificial samarium has an important impact on the operation of a nuclear reactor.
Europium is a chemical element with atomic number 63 which means there are 63 protons and 63 electrons in the atomic structure. The chemical symbol for Europium is Eu. Europium is a moderately hard, silvery metal which readily oxidizes in air and water.
Europium is one of the least abundant elements in the universe. Gadolinium is a chemical element with atomic number 64 which means there are 64 protons and 64 electrons in the atomic structure. The chemical symbol for Gadolinium is Gd. Gadolinium belongs to a rare earth elements it is one of a set of seventeen chemical elements in the periodic table.
In nuclear industry gadolinium is commonly used as a neutron absorber due to very high neutron absorbtion cross-section of two isotopes Gd and Gd. In fact their absorption cross-sections are the highest among all stable isotopes. Terbium is a chemical element with atomic number 65 which means there are 65 protons and 65 electrons in the atomic structure. The chemical symbol for Terbium is Tb. Terbium is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife.
The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. Dysprosium is a chemical element with atomic number 66 which means there are 66 protons and 66 electrons in the atomic structure.
The chemical symbol for Dysprosium is Dy. Dysprosium is used for its high thermal neutron absorption cross-section in making control rods in nuclear reactors, for its high magnetic susceptibility in data storage applications.
Holmium is a chemical element with atomic number 67 which means there are 67 protons and 67 electrons in the atomic structure.
The chemical symbol for Holmium is Ho. Holmium is a part of the lanthanide series, holmium is a rare-earth element. Holmium is a relatively soft and malleable silvery-white metal. Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 electrons in the atomic structure. The chemical symbol for Erbium is Er. Erbium is a silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements.
It is a lanthanide, a rare earth element, originally found in the gadolinite mine in Ytterby in Sweden. Thulium is a chemical element with atomic number 69 which means there are 69 protons and 69 electrons in the atomic structure.
The chemical symbol for Thulium is Tm. Thulium is an easily workable metal with a bright silvery-gray luster. It is fairly soft and slowly tarnishes in air. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. Thulium is the thirteenth and third-last element in the lanthanide series. Ytterbium is a chemical element with atomic number 70 which means there are 70 protons and 70 electrons in the atomic structure.
The chemical symbol for Ytterbium is Yb. Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. Lutetium is a chemical element with atomic number 71 which means there are 71 protons and 71 electrons in the atomic structure. The chemical symbol for Lutetium is Lu. Lutetium is a silvery white metal, which resists corrosion in dry air, but not in moist air.
Lutetium is the last element in the lanthanide series, and it is traditionally counted among the rare earths. Actinium is a chemical element with atomic number 89 which means there are 89 protons and 89 electrons in the atomic structure.
The chemical symbol for Actinium is Ac. Actinium is a soft, silvery-white radioactive metal. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table. Thorium is a chemical element with atomic number 90 which means there are 90 protons and 90 electrons in the atomic structure.
The chemical symbol for Thorium is Th. Thorium metal is silvery and tarnishes black when exposed to air, forming the dioxide. Thorium is moderately hard, malleable, and has a high melting point. Thorium is a naturally-occurring element and it is estimated to be about three times more abundant than uranium. Thorium is commonly found in monazite sands rare earth metals containing phosphate mineral.
Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids.
Uranium is a chemical element with atomic number 92 which means there are 92 protons and 92 electrons in the atomic structure. The chemical symbol for Uranium is U. Uranium is a silvery-white metal in the actinide series of the periodic table. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between , years and 4. Uranium has the highest atomic weight of the primordially occurring elements.
Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. The chemical symbol for Neptunium is Np. Neptunium metal is silvery and tarnishes when exposed to air. Neptunium is the first transuranic element. Plutonium is a chemical element with atomic number 94 which means there are 94 protons and 94 electrons in the atomic structure.
The chemical symbol for Plutonium is Pu. Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. Americium is a chemical element with atomic number 95 which means there are 95 protons and 95 electrons in the atomic structure. The chemical symbol for Americium is Am. Americium is a transuranic member of the actinide series, in the periodic table located under the lanthanide element europium, and thus by analogy was named after the Americas.
Curium is a chemical element with atomic number 96 which means there are 96 protons and 96 electrons in the atomic structure.
The chemical symbol for Curium is Cm. Curium is a hard, dense, silvery metal with a relatively high melting point and boiling point for an actinide. Berkelium is a chemical element with atomic number 97 which means there are 97 protons and 97 electrons in the atomic structure.
The chemical symbol for Berkelium is Bk. Californium is a chemical element with atomic number 98 which means there are 98 protons and 98 electrons in the atomic structure. The chemical symbol for Californium is Cf. Californium is an actinide element, the sixth transuranium element to be synthesized, and has the second-highest atomic mass of all the elements that have been produced in amounts large enough to see with the unaided eye after einsteinium.
The most commonly used spontaneous fission neutron source is the radioactive isotope californium Einsteinium is a chemical element with atomic number 99 which means there are 99 protons and 99 electrons in the atomic structure.
The chemical symbol for Einsteinium is Es. Fermium is a chemical element with atomic number which means there are protons and electrons in the atomic structure. The chemical symbol for Fermium is Fm. Fermium is a member of the actinide series. It is the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities.
Mendelevium is a chemical element with atomic number which means there are protons and electrons in the atomic structure. The chemical symbol for Mendelevium is Md. Mendelevium is a metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities. Nobelium is a chemical element with atomic number which means there are protons and electrons in the atomic structure.
The chemical symbol for Nobelium is No. Nobelium is the tenth transuranic element and is the penultimate member of the actinide series. Like all elements with atomic number over , nobelium can only be produced in particle accelerators by bombarding lighter elements with charged particles. Lawrencium is a chemical element with atomic number which means there are protons and electrons in the atomic structure.
The chemical symbol for Lawrencium is Lr. Lawrencium is the final member of the actinide series. Like all elements with atomic number over , lawrencium can only be produced in particle accelerators by bombarding lighter elements with charged particles. Lanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements.
Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. The actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to , actinium through lawrencium.
Rutherfordium is a chemical element with atomic number which means there are protons and electrons in the atomic structure. The chemical symbol for Rutherfordium is Rf.
Dubnium is a chemical element with atomic number which means there are protons and electrons in the atomic structure. The chemical symbol for Dubnium is Db. Seaborgium is a chemical element with atomic number which means there are protons and electrons in the atomic structure. The chemical symbol for Seaborgium is Sg. Bohrium is a chemical element with atomic number which means there are protons and electrons in the atomic structure.
The chemical symbol for Bohrium is Bh. Hassium is a chemical element with atomic number which means there are protons and electrons in the atomic structure. The chemical symbol for Hassium is Hs. It is a synthetic element first synthesised at Hasse in Germany and radioactive. The most stable known isotope, Hs , has a half-life of approximately 9. It has an estimated density of The density of Hassium results from its high atomic weight and from the significant decrease in ionic radii of the elements in the lanthanide series, known as lanthanide and actinide contraction.
Meitnerium is a chemical element with atomic number which means there are protons and electrons in the atomic structure. The chemical symbol for Meitnerium is Mt. Darmstadtium is a chemical element with atomic number which means there are protons and electrons in the atomic structure. The chemical symbol for Darmstadtium is Ds. Roentgenium is a chemical element with atomic number which means there are protons and electrons in the atomic structure.
The chemical symbol for Roentgenium is Rg. Copernicium is a chemical element with atomic number which means there are protons and electrons in the atomic structure. The chemical symbol for Copernicium is Cn. Nihonium is a chemical element with atomic number which means there are protons and electrons in the atomic structure. The chemical symbol for Nihonium is Nh. Flerovium is a chemical element with atomic number which means there are protons and electrons in the atomic structure.
The chemical symbol for Flerovium is Fl. Moscovium is a chemical element with atomic number which means there are protons and electrons in the atomic structure. The chemical symbol for Moscovium is Mc. Livermorium is a chemical element with atomic number which means there are protons and electrons in the atomic structure. The chemical symbol for Livermorium is Lv.
Tennessine is a chemical element with atomic number which means there are protons and electrons in the atomic structure. The chemical symbol for Tennessine is Ts. Oganesson is a chemical element with atomic number which means there are protons and electrons in the atomic structure. The chemical symbol for Oganesson is Og. Discoverer: Marinsky, Jacob A. Discoverer: Glenn T. Seaborg, Joseph W. Category : Isotopes of iodine. Read what you need to know about our industry portal chemeurope.
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Cookies deactivated. To use all functions of this page, please activate cookies in your browser. Login Register. Additional recommended knowledge. Topics A-Z. All topics. To top. They wanted The abolitionist movement was banned from many Northern states. Some s The emancipation of slaves B.
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A The results marked the beginning of segregation. B The results marked th Another war broke out between Israel and Iraq. Iraq was driven from Kuwa Iodine has many isotopes, but only iodine is stable and is found in nature. To see more answers head over to College Study Guides. Virtual Teaching Assistant: Heather L. Question Level: Basic Karma: Free. Heather L.
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