Chapter 6 Summary of the element Francium and apply.Francium is a chemical element that has the symbol Fr and atomic number 87 เป็นาตุ hunt is a complex containing radioactive "is a distinctive food by the Radium and radon satha Tin because the elements in the Group of alkali metals Alkali metal valence electrons are particle number 1.At least since 1870, they thought that chemists are alkali metals are the elements away again from the element caesium atom is a complex number, is equal to 87 by calls for the time being that ACE-caesium (eka-caesium), and before the actual discovery by the people of France. The name Marguerite Perey marque arit operation last year with the discovery of 1939, which is not valid before at least 4 times. The first operation this KET found moe Her name, whether Actinium-K in the year 1946, she proposed the new name as Catium but one supervisor is Jonathan Stacey-Lee e host Green-Green (Irene Joliot Curie-) does not agree with the proposed change, as she is certified and francium (by the IUPAC) names, such as that in 1949 the name of the country of France area 2 after the element Gallium (Ga: Gallium) was originally the abbreviation that is Fa, and later changed to the current text of interest Fr a francium is that in nature, that have been discovered (the last child element that is found is rhenium Rhenium: Re) discovered in the year 1925. แฟรนเซียมมีความอุดม ( Abundance ) น้อยมากในธรรมชาติ ( น้อยเป็นลำดับที่ 2 รองจากธาตุ แอสทาทิน ) โดยลปนในสินแร่ที่มียูเรเนียมและทอเรียม ซึ่งจะพบ แฟรนเซียม- 223 เกิดขึ้นและสลายอย่างต่อเนื่อง ซึ่งในเปลือกโลกอาจค้นพบได้ฝนเวลาหนึ่งๆประมาณ 340-550 กรัม
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