Chromium Element in Periodic Table | Atomic Number Atomic Mass


Chromium Element:

The chemical element Chromium is a steely-grey, lustrous, hard and brittle metal. Its atomic number is 24 and represented by the symbol Cr. It is d-block transition metal. In the periodic table of elements Cr is a member of group 6 and period 4. Cr is the 22nd most common element found in the Earth's crust, but it is not found in its free metal form.Instead it is mainly found in chromite ore. Four known isotopes, 52Cr, 53Cr, 54Cr and 52Cr are present in naturally occurring Chromium. 52Cr, 53Cr, 54Cr are the most stable isotopes.

Uses Of Chromium Element:

  • It  is used in manufacture of stainless steel and other alloys.
  • Chromium compounds are used as industrial catalysts
  • Chromium compounds are used as pigments in green, yellow, red and orange colours.
  • For polishing steel to shine like mirror, chromium plating is used. Chromium plated plastics are commonly used in sanitary fittings.
  • Chromium is a key element for humans because it helps to use glucose. However, it is poisonous in excess.


Chromium Element Information:

Discovery year: 1797, 1798

Discovered by: Louis Nicolas Vauquelin

Atomic number: 24

Relative atomic mass: 51.996 

Electron configuration: [Ar] 3d5 4s1


Other elements in the same block:

Scandium, Titanium, Vanadium, Manganese, Iron, Cobalt, Nickel, Copper, Zinc, Yttrium, Zirconium, Niobium, Molybdenum, Technetium, Ruthenium, Rhodium, Palladium, Silver, Cadmium, LanthanumHafnium, Tantalum, Tungsten, Rhenium, Osmium, Iridium, Platinum, Gold, Mercury, Actinium, Rutherfordium, Dubnium, Seaborgium, Bohrium, Hassium, Meitnerium, Darmstadtium, Roentgenium and  Copernicium are the elements in the same block.

Period: period 4

Other elements in the same period:

Potassium, Calcium, Scandium, Titanium, Vanadium, Manganese, Iron, Cobalt, Nickel, Copper, Zinc, Gallium, Germanium, Arsenic, Selenium, Bromine and Krypton.

Group: group 6

Other elements in the same group:

Molybdenum, tungsten and Seaborgium are the elements in the same group.

Other elements in the same orbital:

Scandium, Titanium, Vanadium, Manganese, Iron, Cobalt, Nickel, Copper and Zinc are the elements in the same orbital.

Allotropes: none

Key isotopes: 52Cr 

Melting point: 1907°C, 3465°F, 2180 K

Boiling point: 2671°C, 4840°F, 2944 K

Element category: transition metal

Density (g cm−3): 7.15

CAS number: 7440-47-3

Color: silvery 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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