Group 7 element - wikipedia Group 7 element This article does not cite any sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( December 2009 ) For the group VIIA ( CAS ), also referred to as `` Group 7 '', see Halogen. Group 7 in the periodic table Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury ( element ) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson group 6 ← → group 8 IUPAC group number 7 Name by element manganese group CAS group number ( US, pattern A-B-A ) VIIB old IUPAC number ( Europe, pattern A-B ) VIIA ↓ Period Manganese ( Mn ) 25 Transition metal 5 Technetium ( Tc ) 43 Transition metal 6 Rhenium ( Re ) 75 Transition metal 7 Bohrium ( Bh ) 107 Transition metal Legend primordial element element by radioactive decay synthetic element Atomic number color : black = solid Group 7, numbered by IUPAC nomenclature, is a group of elements in the periodic table. They are manganese ( Mn ), technetium ( Tc ), rhenium ( Re ), and bohrium ( Bh ). All known elements of group 7 are transition metals. Like other groups, the members of this family show patterns in their electron configurations, especially the outermost shells resulting in trends in chemical behavior. Contents 1 Chemistry 2 History 3 Occurrence 4 Production 5 Applications 6 Precautions 7 Biological role and precautions 8 See also 9 References Chemistry Z Element No. of electrons / shell 25 manganese 2, 8, 13, 2 43 technetium 2, 8, 18, 13, 2 75 rhenium 2, 8, 18, 32, 13, 2 107 bohrium 2, 8, 18, 32, 32, 13, 2 Bohrium has not been isolated in pure form, and its properties have not been conclusively observed ; only manganese, technetium, and rhenium have had their properties experimentally confirmed. All three elements are typical silvery - white transition metals, hard, and have high melting and boiling points. History See also : Technetium § Search for element 43 Group 7 contains the two naturally occurring transition metals discovered last : technetium and rhenium. Manganese was discovered much earlier owing to its much larger abundance in nature. Rhenium was discovered when Masataka Ogawa found what he thought was element 43 in thorianite, but this was dismissed ; recent studies by H.K. Yoshihara suggest that he discovered rhenium instead, a fact not realized at the time. Walter Noddack, Otto Berg, and Ida Tacke were the first to conclusively identify rhenium ; it was thought they discovered element 43 as well, but as the experiment could not be replicated, it was dismissed. Technetium was formally discovered in December 1936 by Carlo Perrier and Emilio Segré, who discovered Technetium - 95 and Technetium - 97. Bohrium was discovered in 1981 by a team led by Peter Armbruster and Gottfried Münzenburg by bombarding Bismuth - 209 with Chromium - 54. Occurrence Manganese is the only common Group 7 element. In 2007 11 million metric tons of manganese were mined. All other elements are either incredibly rare on earth ( technetium, rhenium ) or completely synthetic ( bohrium ). In contrast to manganese, only 40 or 50 metric tons of rhenium were mined. Technetium is only found in trace amounts in nature as a product of spontaneous fission ; almost all is produced in laboratories. Bohrium is only produced in nuclear reactors and has never been isolated in pure form. Production This section needs expansion. You can help by adding to it. ( February 2012 ) Applications This section needs expansion. You can help by adding to it. ( February 2012 ) Precautions Although being an essential trace element in the human body, manganese can be somewhat toxic if ingested in higher amounts than normal. Technetium should be handled with care due to its radioactivity. Biological role and precautions Only manganese has a role in the human body. It is an essential trace nutrient, with the body containing approximately 10 milligrams at any given time, being mainly in the liver and kidneys. Many enzymes contain manganese, making it essential for life, and is also found in chloroplasts. Technetium, rhenium, and bohrium have no known biological roles. Technetium is however used in radioimaging. See also Periodic table ( Large cells ) 5 6 7 8 9 10 11 12 13 14 15 16 17 18 He Li Be Ne Na Mg Al Si Cl Ar Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr 5 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te Xe 6 Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn 7 Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og Alkali metal Alkaline earth metal Lanthanide Actinide Transition metal Post - ​ transition metal Metalloid Polyatomic nonmetal Diatomic nonmetal Noble gas Unknown chemical properties Periodic table Periodic table forms Standard 18 - column 18 - column, large cells 32 - column, large cells Alternative Alternatives Chemical Galaxy Janet 's left step table Extended Extension beyond the 7th period Fricke model large cells Pyykkö model Sets of elements By periodic table structure Groups 1 ( Alkali metals ) 2 ( Alkaline earth metals ) 5 6 7 8 9 10 11 12 13 14 15 ( Pnictogens ) 16 ( Chalcogens ) 17 ( Halogens ) 18 ( Noble gases ) Periods 5 6 7 8 + Aufbau Fricke Pyykkö Blocks s - block p - block d - block f - block g - block Aufbau principle By metallicity Metals Alkali metals Alkaline earth metals Lanthanides Actinides Superactinides Eka - superactinides Transition metals Post-transition metals Metalloids Lists of metalloids by source Dividing line Nonmetals Polyatomic nonmetals Diatomic nonmetals Noble gases Other sets Nutritional elements Platinum - group metals ( PGM ) Rare - earth elements Refractory metals Precious metals Coinage metals Noble metal Heavy metals Native metals Transuranium elements Transactinide elements Major actinides Minor actinides Elements Lists By : Abundance ( in humans ) Atomic properties Nuclear stability Production Symbol Properties Atomic weight Crystal structure Electron affinity Electron configuration Electronegativity Allen Pauling Goldschmidt classification Maximum valence Data pages Abundance Atomic radius Boiling point Critical point Density Elasticity Electrical resistivity Electron affinity Electron configuration Electronegativity Hardness Heat capacity Heat of fusion Heat of vaporization Ionization energy Melting point Oxidation state Speed of sound Thermal conductivity Thermal expansion coefficient Vapor pressure History Element discoveries Mendeleev 's predictions Naming Etymology controversies places scientists in East Asia See also IUPAC nomenclature systematic element name Trivial name Dmitri Mendeleev Book Chemistry Portal Group 7 elements Manganese Mn Atomic Number : 25 Atomic Weight : 54.938045 Melting Point : 1519.15 K Boiling Point : 2334 K Specific mass : 7.44 g / cm Electronegativity : 1.55 Technetium Tc Atomic Number : 43 Atomic Weight : ( 98 ) Melting Point : 2473.15 K Boiling Point : 5150 K Specific mass : 11.5 g / cm Electronegativity : 1.9 Rhenium Re Atomic Number : 75 Atomic Weight : 186.207 Melting Point : 3453.15 K Boiling Point : 5869 K Specific mass : 21.02 g / cm Electronegativity : 1.9 Bohrium Bh Atomic Number : 107 Atomic Weight : ( 270 ) Melting Point : ? K Boiling Point : ? K Specific mass : ? 37 g / cm Electronegativity : ? References Retrieved from `` https://en.wikipedia.org/w/index.php?title=Group_7_element&oldid=810792896 '' Categories : Groups ( periodic table ) Hidden categories : Articles lacking sources from December 2009 All articles lacking sources Articles to be expanded from February 2012 All articles to be expanded Articles using small message boxes All articles with unsourced statements Articles with unsourced statements from April 2014 Talk Contents About Wikipedia Aragonés Asturianu Azərbaycanca বাংলা Български Bosanski Català Čeština Cymraeg Deutsch Español Esperanto Euskara فارسی Français 한국어 हिन्दी Bahasa Indonesia Italiano Lumbaart Македонски Bahasa Melayu Nederlands 日本 語 Norsk nynorsk ਪੰਜਾਬੀ Polski Português Русский Shqip Slovenčina Slovenščina Soomaaliga Српски / srpski Srpskohrvatski / српскохрватски Suomi Svenska தமிழ் ไทย Українська Tiếng Việt 中文 Edit links This page was last edited on 17 November 2017, at 13 : 46. 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Question: what is group 7 on the periodic table called
Answer: transition metals