Francium Element in Periodic Table | Atomic Number Atomic Mass
Francium is the last element in the Group I of periodic table with atomic number 87. Since its atom has one electron in its outermost s-orbital, it has a tendency to donate one electron to other element which is in need of one electron to attain noble gas electronic configuration. Due to its tendency to donate an electron easily, it is classified as electropositive element, just like all other elements in the first group of periodic table.
Francium is an extremely radioactive element. Due to its high radioactivity, the most stable isotope 223Fr has a half-life of only 22 minutes, making it impracticable to study in detail its ostensible physical properties. As francium is an element of high instability, most of its properties have been assumed in accordance with that of other elements of the same group.
There are in total 34 isotopes of francium which have mass numbers starting from 199 to 232. Due to its nature of being highly unstable and rarity of its occurrence, caesium does not have any commercial applications.
Francium Element Information:
Discovered by:Marguerite Perey
Atomic number: 87
Relative atomic mass: 
Electron configuration: [Rn] 7s1
Other elements in the same block:
Period: period 7
Other elements in the same period:
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 and Oganesson.
Group: group 1 (alkali metals)
Other elements in the same group:
Other elements in the same orbital:
Radium is the element in the same orbital.
Key isotopes: 223Fr
Melting point: 21°C, 70°F, 294 K
Boiling point: 650°C, 1202°F, 923 K
Element category: alkali metal
Density (g cm−3): Unknown
CAS number: 7440-73-5
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