Appearance Electrical conductivity Melting point ("C) Strength Density as solid (g/cm 3) Metal or non-metal silvery conductor 961 strong 10.5 b purple-black insulator 114 weak 4.9 C shiny white conductor 232 fairly strong 7.3 d dark grey insulator 217 weak 4.8 e brown insulator -7 3.1 green insulator - 101 1.6 g yellow conductor 1063 strong 19.3 h silvery conductor - 39 13.6 black conductor 3730 weak 2.2 L. silvery white conductor 98 strong 0.9