Fermium

authors AZav and KMor
francium occurs as a result of α disintegration of actinium. Francium is found in uranium minerals, and can be made artificially by bombarding thorium with protons. It is the most unstable of the first 101 elements. The longest lived isotope, 223Fr, a daughter of 227Ac, has a half-life of 22 minutes. This is the only isotope of francium occurring in nature, but at most there is only 20-30 g of the element present in the earth's crust at any one time. No weighable quantity of the element has been prepared or isolated. There are about 20 known isotopes. Table: basic information about and classifications of francium.|| * Name: Francium
 * Symbol: Fr
 * Atomic number: 87
 * Atomic weight: [ 223 ]
 * Standard state: solid at 298 K
 * CAS Registry ID: 7440-73-5
 * * Group in periodic table: 1
 * Group name: Alkali metal
 * Period in periodic table: 7
 * Block in periodic table: s-block
 * Colour: metallic
 * Classification: Metallic ||

__**History**__
Francium was discovered in 1939 by the Frenchwoman Marguerite Perey, who established the presence of a 21-minute radio-isotope with properties of an heavy alkali element among the decay products of actinium. Mlle. Perey also isolated this product, determined its radio-chemical and nuclear properties, and showed that actinium is a product of radioactive decay. The initial propo Francium was discovered in 1939 by the Frenchwoman Marguerite Perey, who established the presence of a 21-minute radio-isotope with properties of an heavy alkali element among the decay products of actinium. Mlle. Perey also isolated this product, determined its radio-chemical and nuclear properties, and showed that actinium is a product of radioactive decay. The initial proposed name was "actinium K", following the naming system for natural radioactive sources. Later, she proposed the name francium in honor of her country - France. With the exception of some transuranians, francium is the most unstable element known. Its chemistry is not well known but we can say that it is similar to the other heavier elements of the family such as rubidium and cesium. sed name was "actinium K", following the naming system for natural radioactive sources. Later, she proposed the name francium in honor of her country - France. With the exception of some transuranians, francium is the most unstable element known. Its chemistry is not well known but we can say that it is similar to the other heavier elements of the family such as rubidium and cesium.
 * number of energy levels:7**
 * First Energy Level:** 2
 * Second Energy Level:** 8
 * Third Energy Level:** 18
 * Fourth Energy Level:** 32
 * Fifth Energy Level:** 18
 * Sixth Energy Level:** 8
 * Seventh Energy Level:** 1