Science Periodic Table - Elements - Boron Symbol B Atomic Number 5 Relative Atomic Mass 12C = 12.0000 10.811 Atomic Radius pm 83 First Ionisation Energy kJ mol-1 800.6 Electronegativity 2.04 Density kg m-3 2340 (β-rhomb.) [293 K] Molar Volume cm3 4.62 Thermal Conductivity W m-1 K-1 27.0 [300 K] Melting Point K 2573 Boiling Point K 3931 Number of Isotopes 6 Ground State Electron Configuration [He]2s22p1 Term Symbol 2P1/2 Discovery Discovered by L.J. Thenard and L.J. Lussac (Paris, France) and Sir H. Davey (London, England) in 1808 Name Derived From Arabic buraq Name in Other Languages  Croatian Bor  Danish bor  Dutch boor  Finnish boori  French bore  German Bor  Italian boro  Norwegian bor  Portuguese boro  Spanish boro  Swedish bor Peter van der Krogt's Element Multidict - element name translations in over 48 langauges

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