Hydrogen vs Chromium

Side-by-side comparison of Hydrogen (H, element 1) and Chromium (Cr, element 24) by atomic structure and physical properties.

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PropertyH Hydrogen Cr Chromium
Atomic number124
SymbolHCr
NameHydrogenChromium
Categorynonmetaltransition-metal
Standard Atomic Weight1.007975 u51.9961 u
Period14
Group16
Blocksd
Phase at STPGasSolid
Electron configuration1s1[Ar]3d54s1
Oxidation states[-1, 1][-4, -2, -1, 0, 1, 2, 3, 4, 5, 6]
Electronegativity (Pauling)2.21.66
Electron affinity0.75419 eV0.675 eV
Density0.08988 kg/m³7150 kg/m³
Melting point-259.193 °C1906.85 °C
Boiling point-252.781 °C2670.85 °C
Discovery year17661797

Key Differences

PropertyH HydrogenCr Chromium
Standard Atomic Weight1.007975 u ↓ lower51.9961 u ↑ higher
Density0.08988 kg/m³ ↓ lower7150 kg/m³ ↑ higher
Melting point-259.193 °C ↓ lower1906.85 °C ↑ higher
Boiling point-252.781 °C ↓ lower2670.85 °C ↑ higher
Electronegativity (Pauling)2.2 ↑ higher1.66 ↓ lower
Electron affinity0.75419 eV ↑ higher0.675 eV ↓ lower
Period1 4
Group1 6
Blocks d
Categorynonmetal transition-metal
Phase at STPGas Solid
Electron configuration1s1 [Ar]3d54s1
Discovery year1766 1797