density at 298 K: g/cm 3 melting point: K boiling point: K conductivity: Wm -1 K -1 reacts explosively with air (if sparked) forms HCl combining power: 1 colorless gas nonmetal Hydrogen, H atomic mass: 1.00 density at 298 K: g/cm 3 melting point: 0.95 K boiling point: 4.22 K conductivity: Wm -1 K -1 reactivity: inert example compound: combining power: description: colorless gas nonmetal Helium, He atomic mass: 4.00 density at 298 K: g/cm 3 melting point K boiling point: K conductivity: Wm -1 K -1 colorless gas nonmetal Neon, Ne atomic mass: density at 298 K: g/cm 3 melting point K boiling point: K conductivity: Wm -1 K -1 colorless gas nonmetal Argon, Ar atomic mass: density at 298 K: g/cm 3 melting point K boiling point: K conductivity: Wm -1 K -1 colorless gas nonmetal Krypton, Kr atomic mass: density at 298 K: g/cm 3 melting point K boiling point: K conductivity: Wm -1 K -1 colorless gas nonmetal Xenon, Xe atomic mass: nonreactive

density at 298 K: g/cm 3 melting point: K boiling point: K conductivity: 85 Wm -1 K -1 reactivity: reacts with water forms LiCl solid combining power: 1 silvery solid metal Lithium, Li atomic mass: 6.94 density at 298 K: g/cm 3 melting point: K boiling point: 1156 K conductivity: 140 Wm -1 K -1 soft, silvery solid metal Sodium, Na atomic mass: reacts vigorously with water forms NaCl solid combining power: 1 density at 298 K: g/cm 3 melting point: K boiling point: 1032 K conductivity: 100 Wm -1 K -1 very soft silvery solid metal Potassium, K atomic mass: density at 298 K: g/cm 3 melting point: K boiling point: 961 K conductivity: 58 Wm -1 K -1 extremely soft, silvery solid metal Rubidium, Rb atomic mass: reacts violently with water forms KCl solid combining power: 1 reacts explosively with water forms RbCl solid combining power: 1

density at 298 K: g/cm 3 melting point: 1560 K boiling point: 2742 K conductivity: 190 Wm -1 K -1 does not react with water forms BeCl 2 solid combining power: 2 hard, lead-gray solid metal Beryllium, Be atomic mass: 9.01 density at 298 K: g/cm 3 melting point: 923 K boiling point: 1363 K conductivity: 156 Wm -1 K -1 moderately hard, silvery-white solid metal Magnesium, Mg atomic mass: reacts very slowly with water forms MgCl 2 solid combining power: 2 density at 298 K: g/cm 3 melting point: 1115 K boiling point: 1757 K conductivity: 200 Wm -1 K -1 moderately hard, silvery-white solid metal Calcium, Ca atomic mass: density at 298 K: g/cm 3 melting point: 1050 K boiling point: 1655 K conductivity: 35 Wm -1 K -1 moderately soft, silvery-white solid metal Strontium, Sr atomic mass: reacts slowly with water forms CaCl 2 solid combining power: 2 reacts vigorously with water forms SrCl 2 solid combining power: 2

density at 298 K: g/cm 3 melting point: 2349 K boiling point: 4200 K conductivity: 27 Wm -1 K -1 does not react with oxygen in air forms BCl 3 solid combining power: 3 hard, black solid metalloid Boron, B atomic mass: density at 298 K: g/cm 3 melting point: K boiling point: 2792 K conductivity: 235 Wm -1 K -1 moderately hard, silvery solid metal Aluminum, Al atomic mass: does not react with oxygen in air forms AlCl 3 solid combining power: 3 density at 298 K: g/cm 3 melting point: K boiling point: 2477 K conductivity: 29 Wm -1 K -1 moderately soft, silvery-white solid metal Gallium, Ga atomic mass: density at 298 K: g/cm 3 melting point: K boiling point: 2345 K conductivity: 82 Wm -1 K -1 moderately soft, silvery-lustrous gray solid metal Indium, In atomic mass: does not react with oxygen in air forms GaCl 3 solid combining power: 3 reacts very slowly with oxygen in air forms InCl 3 solid combining power: 3

density at 298 K: g/cm 3 melting point: 3800 K boiling point: 4300 K conductivity: 140 Wm -1 K -1 (of metalloid form) does not react with oxygen in air forms CH 4 gas combining power: 4 hard, clear colorless solid (diamond) Nonmetal or soft, black solid metalloid Carbon, C atomic mass: density at 298 K: g/cm 3 melting point: 1687 K boiling point: 3173 K conductivity: 150 Wm -1 K -1 moderately hard, greyish solid metalloid Silicon, Si atomic mass: reacts very slowly with oxygen in air forms SiH 4 gas combining power: 4 density at 298 K: g/cm 3 melting point: 1211 K boiling point: 3093 K conductivity: 60 Wm -1 K -1 moderately soft, grayish-white solid metalloid Germanium, Ge atomic mass: density at 298 K: g/cm 3 melting point: K boiling point: 2875 K conductivity: 67 Wm -1 K -1 moderately soft, silvery-lustrous gray solid metal Tin, Sn atomic mass: Reacts very slowly with oxygen in air forms GeH 4 gas combining power: 4 reacts very slowly with oxygen in air forms SnH 4 gas combining power: 4

density at 298 K: g/cm 3 melting point: K boiling point: K conductivity: Wm -1 K -1 not very reactive forms NH 3 gas combining power: 3 colorless gas nonmetal Nitrogen, N atomic mass: density at 298 K: g/cm 3 melting point: K boiling point: 550 K conductivity: Wm -1 K -1 brittle, red solid nonmetal Phosphorus, P atomic mass: does not react with oxygen in air forms PH 3 gas combining power: 3 density at 298 K: g/cm 3 melting point: 354 K boiling point: 887 K conductivity: 50 Wm -1 K -1 moderately soft, steel gray solid metalloid Arsenic, As atomic mass: density at 298 K: g/cm 3 melting point: K boiling point: 1860 K conductivity: 24 Wm -1 K -1 moderately soft, silvery-lustrous gray solid metalloid Antimony, Sb atomic mass: reacts very slowly with oxygen in air forms AsH 3 gas combining power: 3 reacts very slowly with oxygen in air forms SbH 3 gas combining power: 3

density at 298 K: g/cm 3 melting point: K boiling point: K conductivity: Wm -1 K -1 reacts very slowly with metals forms H 2 O liquid combining power: 2 colorless gas nonmetal Oxygen, O atomic mass: density at 298 K: g/cm 3 melting point: K boiling point: K conductivity: Wm -1 K -1 brittle, yellow solid nonmetal Sulfur, S atomic mass: reacts slowly with metals forms H 2 S gas combining power: 2 density at 298 K: g/cm 3 melting point: 494 K boiling point: 958 K conductivity: 0.52 Wm -1 K -1 moderately hard, lustrous gray solid nonmetal Selenium, Se atomic mass: density at 298 K: g/cm 3 melting point: K boiling point: 1261 K conductivity: 3 Wm -1 K -1 moderately hard, silvery-lustrous grey solid metalloid Tellurium, Te atomic mass: reacts very slowly with metals forms H 2 Se gas combining power: 2 reacts very slowly with metals forms H 2 Te gas combining power: 2

density at 298 K: g/cm 3 melting point: K boiling point: K conductivity: Wm -1 K -1 pale yellow gas nonmetal Fluorine, F atomic mass: density at 298 K: g/cm 3 melting point: K boiling point: K conductivity: Wm -1 K -1 yellowish-green gas nonmetal Chlorine, Cl atomic mass: density at 298 K: 3.12 g/cm 3 melting point: K boiling point: 332 K conductivity: 0.12 Wm -1 K -1 red-brown liquid nonmetal Bromine, Br atomic mass: density at 298 K: 4.93 g/cm 3 melting point: K boiling point: K conductivity: Wm -1 K -1 violet-dark grey lustrous solid nonmetal Iodine, I atomic mass: reacts with metals forms HI gas combining power: 1 reacts vigorously with metals forms HBr gas combining power: 1 reacts violently with metals forms HCl gas combining power: 1 reacts explosively with metals forms HF gas combining power: 1