group element group group elements periodic table group like block groups contain elements agreed elements belong group included spaces usually occupied frequently considered group expanded elements included contracted contain group acquired trivial called rare earth metals group elements occur naturally continues trend started lighter members general chemical behavior similarly accordance trend period transition metals behave similarly upper periodic table neighbors trend seen identical mercury distant shares equal atomic size similar properties white metals standard conditions fourth element radioactive occurs trace amounts continues trend chemical behavior metals form noble gas configuration synthetic calculated partially shown similar far experiments conducted element group element considered group element preceded synthesized near future spaces away current heaviest element known history swedish time chemist found heavy black rock near swedish village sweden thinking unknown mineral containing newly discovered element named finnish scientist identified new earth sample published completed analysis new named decades french scientist developed modern definition chemical elements believed reduced elements meaning discovery new earth equivalent discovery element case early 1920s chemical symbol element came common use metal isolated heated iii potassium form metallic potassium russian chemist published periodic table spaces elements directly predictions upper neighbor called swedish chemist team discovered missing element minerals prepared grams iii high purity named meaning scandinavia chemical experiments element proved suggestions correct discovery characterization proved periodic table periodic law apparently unaware prediction recognized correspondence notified metallic produced time mixture potassium independently discovered french scientist austrian baron american chemist mineral thought consist entirely proposed names element star new naming proposals rejected german scientists 1950s called element chose names latin new latin paris new element dispute priority discovery documented articles accuse publishing results influenced published research commission responsible names new elements settled dispute granting priority adopting names official ones obvious problem decision members commission separation described naming honor went eventually reverted spelling element changed ironically stayed argument priority worked larger scale undoubtedly possessed largest supply time synthesized team february called california united_states produced bombarding target consisting element originally reported reassigned team suggested inventor particle symbol new element adopted officially accepted instead nuclear physics researchers russia reported able confirm american scientists data years earlier team reported trans officially recognized element confirmed naming symbol named nuclear physics teams far experiments conducted element group element considered group elements element group element element filling electronic configurations stops principle according principle electronic configuration filling stopped element calculated start filled element closes element filling begins hard element group element calculations suggest element group element considered group elements element fifth group element element calculated electronic configuration associated transition metals having partially filled experiments performed create element considered group element element lowest atomic number tried created chances element considered preceded unlikely created imply periodic table ends soon island stability characteristics chemical like groups members family patterns electron configurations especially shells resulting trends chemical behavior exception electron transferred effects chemistry observed members group chemical properties especially characterized remaining elements group metals high melting points respectively usually state form lower states elements especially obvious formation stable layer prevents reactions iii iii iii iii white high temperature melting iii iii exhibit weak basic character iii iii strongly basic physical elements electronic configuration noble gas clear trend physical properties time group continued trends broken example soft metals soft elements far nucleus compared charges series significantly smaller atomic radius higher nucleus charge making extraction form metallic bonding difficult making metal harder suits previous elements better properties melting boiling points little known physical properties confirmed group borders disputed included group block groups composed transition metals group considered follow suit classified group elements controversial elements follow group proposed resolution debate basis moving column table consideration option results continuous sequence atomic number increase finds group consist current definition term includes elements including transition element applies correctly follow principle normally electron enter quantum mechanical research found configuration actually effects recommended specific format line block periodic table leaving dispute open considered remaining members group commonly encountered forms elements possess partially filled continuing trend elements relationship similar elements calcium series elements left neighbors block different behavior observed block groups especially group share similar chemical properties lacking clear trend tables classified remaining members group tables end succeed series respectively shell nominally ground state electron configuration metals behave similarly period period transition metals compared exhibit properties similar tables including official table refer marker group believed inclusion elements included group metals closely related chemistry similarities additional properties characteristic partially filled common exclusion elements based properties earlier wider variety chemistry instance range states series comparisons useful elements stabilized closely match chemistry laws similar later onwards behave like corresponding shown occurrence tend occur tend occur earth crust harder extract abundance elements earth crust group low elements group uncommon abundant abundance approximately parts million abundance comparison abundance copper distributed sparsely occurs trace amounts minerals rare minerals scandinavia madagascar known concentrated sources element containing form iii trend occurrence places found lunar rock samples collected relatively high content principal commercially viable ore rare earth mineral etc contains element main mining areas china united_states brazil india sri_lanka australia pure metal expensive rare earth metals price fourth gold production available element group annual production tonnes produced single country china obtained annual production tonnes respectively group elements mined extraction elements metallic elements extremely rare production metallic tonnes order year production calculated certainly small elements rare earth metals isolated converted reactions acid resulting reduced earth metals metals metallic calcium frequently example applications biological chemistry group elements generally hard metals low low availability group element documented biological role living organisms generally makes highly toxic living cells causing radiation poisoning biological role found living organisms reached human liver threat compounds possibly general toxic known reached food chain trace amounts typical human takes day released environment gradually soils leads increased concentrations soil particles animals humans dangerous working environment fact gases air cause lung especially long term exposure element known damage cell membranes water animals causing negative influences reproduction functions nervous system known biological role found organisms tends concentrate liver kidney lungs bones humans normally little found entire human body human breast milk contains found edible plants concentrations fresh weight having largest seeds woody plants highest known concentrations biological role found highest known organism humans concentrating bones lesser extent liver known cause occur nature element abundant human body human monitored content known average human takes year coming tiny amounts taken plants mildly toxic ones high highly toxic living cells causing radiation poisoning links related articles
Group 3 element