Francium Element in Periodic Table | Atomic Number Atomic Mass


Francium Element:

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:

Discovery year:1939

Discovered by:Marguerite Perey

Atomic number: 87

Relative atomic mass: [223] 

Electron configuration: [Rn] 7s1

Block: s-block

Other elements in the same block:

Hydrogen, Helium, Lithium, Beryllium, Sodium, Magnesium, Potassium, Calcium, Rubidium, Strontium, Caesium, Barium and Radium are other elements in the s-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:

Hydrogen, Lithium, Sodium, Potassium, Rubidium and Caesium are the elements in the same group

Other elements in the same orbital:

Radium is the element in the same orbital.

Allotropes: none

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 

Color: silver-gray-metallic

You can know detailed information for each element,

Hydrogen, HeliumLithiumBerylliumBoronCarbonNitrogenOxygenFluorine,  Neon , SodiumMagnesiumAluminiumSiliconPhosphorusSulfurChlorineArgon, PotassiumCalciumScandiumTitaniumVanadiumChromiumManganeseIronCobaltNickelCopperZincGalliumGermaniumArsenicSeleniumBromine, Krypton,  Rubidium, StrontiumYttriumZirconiumNiobiumMolybdenumTechnetiumRutheniumRhodiumPalladiumSilverCadmiumIndiumTinAntimonyTelluriumIodine, Xenon,  Caesium, BariumLanthanum,  CeriumPraseodymiumNeodymiumPromethiumSamariumEuropiumGadoliniumTerbiumDysprosiumHolmiumErbiumThuliumYtterbiumLutetiumHafniumTantalumTungstenRheniumOsmiumIridiumPlatinumGoldMercuryThalliumLeadBismuthPoloniumAstatine, Radon,  Francium, RadiumActiniumThoriumProtactiniumUraniumNeptuniumPlutoniumAmericiumCuriumBerkeliumCaliforniumEinsteiniumFermiumMendeleviumNobeliumLawrenciumRutherfordiumDubniumSeaborgiumBohriumHassiumMeitneriumDarmstadtiumRoentgeniumCoperniciumNihoniumFleroviumMoscoviumLivermoriumTennessine, Oganesson.

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