Hydrogen vs Boron

Side-by-side comparison of Hydrogen (H, element 1) and Boron (B, element 5) by atomic structure and physical properties.

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PropertyH Hydrogen B Boron
Atomic number15
SymbolHB
NameHydrogenBoron
Categorynonmetalmetalloid
Standard Atomic Weight1.007975 u10.8135 u
Period12
Group113
Blocksp
Phase at STPGasSolid
Electron configuration1s1[He]2s22p1
Oxidation states[-1, 1][-5, -1, 0, 1, 2, 3]
Electronegativity (Pauling)2.22.04
Electron affinity0.75419 eV0.27972 eV
Density0.08988 kg/m³2370 kg/m³
Melting point-259.193 °C2074.85 °C
Boiling point-252.781 °C3999.85 °C
Discovery year17661808

Key Differences

PropertyH HydrogenB Boron
Standard Atomic Weight1.007975 u ↓ lower10.8135 u ↑ higher
Density0.08988 kg/m³ ↓ lower2370 kg/m³ ↑ higher
Melting point-259.193 °C ↓ lower2074.85 °C ↑ higher
Boiling point-252.781 °C ↓ lower3999.85 °C ↑ higher
Electronegativity (Pauling)2.2 ↑ higher2.04 ↓ lower
Electron affinity0.75419 eV ↑ higher0.27972 eV ↓ lower
Period1 2
Group1 13
Blocks p
Categorynonmetal metalloid
Phase at STPGas Solid
Electron configuration1s1 [He]2s22p1
Discovery year1766 1808