Lithium Element in Periodic Table | Atomic Number Atomic Mass


Lithium Element:

Lithium is the lightest solid metal in the first group of periodic table. Its atomic number is three. Its atomic structure comprises a completely filled s-orbital and only one electron in its p-orbital. Due to the presence of incompletely p-orbital, it is very reactive and is seldom found freely in nature.

Pure lithium metal is preserved in since it catches fire when it comes in contact with oxygen in the air. When cut open, it displays metallic lustre momentarily which soon changes into greyish white tinge due to corrosion by moist air and immediately into black colour.


There are two isotopes of lithium occurring naturally, Li -6 and Li-7, of which Li-7 is more abundant by 92.5% in nature.

Uses of Lithium Element:

  1. It  is used in ceramic and glass industry.
  2. It is used as an important component of battery electrolytes and electrodes, because of its high electrode potential.
  3. It is used in preparing high-temperature resistant greases in industries.
  4. Metallic lithium or its complex hydrides like lithium aluminum hydride are used as high-energy additives to rocket propellants. Lithium aluminum hydride itself is used as a solid fuel.
  5. It is used as a medicinal remedy in treating bipolar disorder, schizophrenia etc.


Lithium Element Information:

Discovery year: 1817

Discovered by: Johan August Arfwedson

Atomic number: 3

Relative atomic mass: 6.938, 6.997

Electron configuration: [He] 2s1

Block: s-block

Other elements in the same block

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

Period: period 2

Other elements in the same period

Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine and  Neon  are the elements in the same period

Group: group 1 (alkali metals)

Other elements in the same group

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

Other elements in the same orbital

Beryllium is the element in the same orbital.

Allotropes: none

Key isotopes: 7Li 

Melting point: 453.65 K (180.50 °C, 356.90 °F)

Boiling point:1603 K (1330 °C, 2426 °F)

Element category: alkali metal

Density (g cm−3): 0.534 g/cm3

CAS number:  7439-93-2

Color: silvery-white

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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