Science Periodic Table - Elements - Silicon Symbol Si Atomic Number 14 Relative Atomic Mass 12C = 12.0000 28.0855 Atomic Radius pm 117 First Ionisation Energy kJ mol-1 786.5 Electronegativity 1.90 Density kg m-3 2329 [293 K] 2525 [l., m.p.] Molar Volume cm3 12.06 Thermal Conductivity W m-1 K-1 148 [300 K] Melting Point K 1683 Boiling Point K 2628 Number of Isotopes 11 Ground State Electron Configuration [Ne]3s23p2 Term Symbol 3P0 Discovery Discovered by J.J. Berzelius (Stockholm, Sweden) in 1824 Name Derived From Latin silicis meaning 'flint' Name in Other Languages  Croatian Silicij  Danish silicium  Dutch silicium  Finnish pii  French silicium  German Silicium  Italian silicio  Norwegian silisium  Portuguese silício  Spanish silicio  Swedish kisel Peter van der Krogt's Element Multidict - element name translations in over 48 langauges

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