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24Cr51.996
Chromium
Transition MetalChromium is a chemical element with symbol Cr and atomic number 24. It is the first element in Group 6. It is a steely-gray, lustrous, hard and brittle metal which takes a high polish, resists tarnishing, and has a high melting point.
Phase: SolidAppearance: silvery metallic
2, 8, 13, 1
Physical Properties
Atomic Mass51.99616 u
Density7.19 g/cm³
Melting Point2180 K
Boiling Point2944 K
Molar Heat23.35 J/(mol·K)
Period4
PhaseSolid
Chemical Properties
Electron Configuration1s2 2s2 2p6 3s2 3p6 4s1 3d5
Semantic Config[Ar] 3d5 4s1
Shells2, 8, 13, 1
Electron Affinity65.21 kJ/mol
Electronegativity1.66
Ionization Energies
IE1: 652.9 kJ/molIE2: 1590.6 kJ/molIE3: 2987 kJ/molIE4: 4743 kJ/molIE5: 6702 kJ/molIE6: 8744.9 kJ/molIE7: 15455 kJ/molIE8: 17820 kJ/molIE9: 20190 kJ/molIE10: 23580 kJ/molIE11: 26130 kJ/molIE12: 28750 kJ/molIE13: 34230 kJ/molIE14: 37066 kJ/molIE15: 97510 kJ/molIE16: 105800 kJ/molIE17: 114300 kJ/molIE18: 125300 kJ/molIE19: 134700 kJ/molIE20: 144300 kJ/molIE21: 157700 kJ/molIE22: 166090 kJ/molIE23: 721870 kJ/molIE24: 761733 kJ/mol
Discovery
Discovered byLouis Nicolas Vauquelin