Tirohia te wāhanga i raro nei, kātahi ka whakautu i te pātai i muri mai i te reo kotahi me te wāhanga:  Te rerenga: Ko te kaimatai Soviet D. K. Dobroserdov te kaiputaiao tuatahi i kii kua kitea e ia te eka-caesium, te francium ranei. I te tau 1925, i kitea e ia he ngoikoretanga ngoikore i roto i te tauira o te potassium, tetahi atu konganuku alkali, a he mea he i whakatau ko te eka-caesium e whakapoke ana i te tauira (ko te ngoikoretanga mai i te tauira mai i te radioisotope potassium, potassium-40). I whakaputaina e ia he tuhinga mo ana matapae mo nga taonga o te eka-caesium, i reira i tapaina ai e ia te huānga ko te russium i muri i tona whenua. I muri tata mai, ka tiimata a Dobroserdov ki te arotahi ki tana mahi whakaako i te Whare Wananga Polytechnic o Odessa, a kaore ia i whai atu i te waahanga. I te tau e whai ake nei, i tirotirohia e nga kaimatai Ingarihi a Gerald J. F. Druce me Frederick H. Loring nga whakaahua X-ray o te manganese ((II) sulfate. I kite rātau i ngā rārangi āhuahanga i whakaarotia e rātau he eka-caesium. I kii ratou i to raatau kitenga o te huānga 87 me te tono i te ingoa alkalinium, na te mea koinei te maitai alkali tino taumaha. I te tau 1930, i kii a Fred Allison o te Alabama Polytechnic Institute kua kitea e ia te huānga 87 i a ia e wetewete ana i te poke me te lepidolite ma tana miihini miihini. I tono a Allison kia tapaina ko te virginium i muri i tana whenua o Virginia, me nga tohu Vi me Vm. I te tau 1934, i whakakahoretia e H.G. MacPherson o UC Berkeley te whai huatanga o te taputapu a Allison me te whaimana o tana kitenga. I te tau 1936, i tirotirohia e te kairangahau Romanian a Horia Hulubei me tana hoa French a Yvette Cauchois, i tenei wa ma te whakamahi i a raatau taputapu X-ray teitei. I kite rātau i ētahi rārangi tuku ngoikore, i whakaaro rātau ko ērā o te huānga 87. I ripoata a Hulubei raua ko Cauchois i ta raua kitenga, a i whakaarohia te ingoa moldavium, me te tohu Ml, i muri i a Moldavia, te kawanatanga o Romania i whanau ai a Hulubei. I te tau 1937, i whakahehia te mahi a Hulubei e te kaimanaaki o Amerika a F. H. Hirsh Jr., nana nei i whakakahore nga tikanga rangahau a Hulubei. I tino mohio a Hirsh e kore e kitea te eka-caesium i te taiao, a kua kite a Hulubei i te mea...  Pātai: He aha te huānga whakarewa tau i kitea i te tau 1930?
wāhanga 87